diff --git a/EnvelopeGenerator.Web/Models/AnnotationParams.cs b/EnvelopeGenerator.Web/Models/AnnotationParams.cs
index 011858cb..d52126f7 100644
--- a/EnvelopeGenerator.Web/Models/AnnotationParams.cs
+++ b/EnvelopeGenerator.Web/Models/AnnotationParams.cs
@@ -1,50 +1,66 @@
-namespace EnvelopeGenerator.Web.Models;
+using System.Text.Json.Serialization;
+
+namespace EnvelopeGenerator.Web.Models;
 
 public class AnnotationParams
 {
+    [JsonIgnore]
     public Annotation? DefaultAnnotation { get; init; }
 
-    private readonly Dictionary<string, Annotation> _annots = new();
+    private readonly IEnumerable<Annotation> _annots = new List<Annotation>();
 
-    public required Dictionary<string, Annotation> Annotations
+    public Annotation this[string name] => _annots.First(a => a.Name == name);
+
+    public bool TryGet(string name, out Annotation annotation)
+    {
+#pragma warning disable CS8601 // Possible null reference assignment.
+        annotation = _annots.FirstOrDefault(a => a.Name == name);
+#pragma warning restore CS8601 // Possible null reference assignment.
+        return annotation is not null;
+    }
+
+    [JsonIgnore]
+    public IEnumerable<string> Names => _annots.Select(annot => annot.Name);
+
+    public required IEnumerable<Annotation> Annotations
     {
         get => _annots;
         init
         {
             _annots = value;
 
-            foreach (var name in _annots.Keys)
+            foreach (var name in Names)
             {
                 #region set default values
                 if(DefaultAnnotation is not null)
                 {
                     // To set default value, annotation must have default (0) value but default must has non-default value
-                    if (_annots[name]._left == default && DefaultAnnotation.Left != default)
-                        _annots[name]._left = DefaultAnnotation.Left;
+                    if (this[name]._left == default && DefaultAnnotation.Left != default)
+                        this[name]._left = DefaultAnnotation.Left;
 
-                    if (_annots[name]._top == default && DefaultAnnotation.Top != default)
-                        _annots[name]._top = DefaultAnnotation.Top;
+                    if (this[name]._top == default && DefaultAnnotation.Top != default)
+                        this[name]._top = DefaultAnnotation.Top;
 
-                    if (_annots[name]._width == default && DefaultAnnotation.Width != default)
-                        _annots[name]._width = DefaultAnnotation.Width;
+                    if (this[name]._width == default && DefaultAnnotation.Width != default)
+                        this[name]._width = DefaultAnnotation.Width;
 
-                    if (_annots[name]._height == default && DefaultAnnotation.Height != default)
-                        _annots[name]._height = DefaultAnnotation.Height;
+                    if (this[name]._height == default && DefaultAnnotation.Height != default)
+                        this[name]._height = DefaultAnnotation.Height;
                 }
                 #endregion
 
                 #region set bound annotations
                 // horizontal
-                if (_annots[name].HorBoundAnnotName is string horBoundAnnotName)
-                    if (_annots.TryGetValue(horBoundAnnotName, out var horBoundAnnot))
-                        _annots[name].HorBoundAnnot = horBoundAnnot;
+                if (this[name].HorBoundAnnotName is string horBoundAnnotName)
+                    if (TryGet(horBoundAnnotName, out var horBoundAnnot))
+                        this[name].HorBoundAnnot = horBoundAnnot;
                     else
                         throw new InvalidOperationException($"{horBoundAnnotName} added as bound anotation. However, it is not defined.");
 
                 // vertical
-                if (_annots[name].VerBoundAnnotName is string verBoundAnnotName)
-                    if (_annots.TryGetValue(verBoundAnnotName, out var verBoundAnnot))
-                        _annots[name].VerBoundAnnot = verBoundAnnot;
+                if (this[name].VerBoundAnnotName is string verBoundAnnotName)
+                    if (TryGet(verBoundAnnotName, out var verBoundAnnot))
+                        this[name].VerBoundAnnot = verBoundAnnot;
                     else
                         throw new InvalidOperationException($"{verBoundAnnotName} added as bound anotation. However, it is not defined.");
                 #endregion
diff --git a/EnvelopeGenerator.Web/appsettings.json b/EnvelopeGenerator.Web/appsettings.json
index aec7c0d7..3574a25b 100644
--- a/EnvelopeGenerator.Web/appsettings.json
+++ b/EnvelopeGenerator.Web/appsettings.json
@@ -155,15 +155,18 @@
       "Width": 1,
       "Height": 0.5
     },
-    "Annotations": {
-      "Signature": {
+    "Annotations": [
+      {
+        "Name": "Signature"
       },
-      "City": {
+      {
+        "Name": "City",
         "VerBoundAnnotName": "Signature"
       },
-      "Date": {
+      {
+        "Name": "Date",
         "VerBoundAnnotName": "City"
       }
-    }
+    ]
   }
 }