How can i get dynamic variable with serialization?

How can i achieve this in my script as (Unity Analytics Event) script have dynamic variable system



In the above attached image the serialized field is highlighted and in that script i have option to assign dynamic variable. so i want same for my own script. I have searched it already on Stackoverflow and unity forum but i can't find!
The above attached image is of a plugin (Unity Analytics Event) & when i attached that script to a game object i have option to assign a dynamic variable from inspector as shown in above attached image so i want same thing for my own script. how can i achieve same for my own script I have tried custom Unity event but failed.

Thank you very much in advance!

 

You have to create a custom inspector for your class using UnityEditor code, which has a bit of a learning curve.

Here is a manual page about UnityEditor coding:
https://docs.unity3d.com/ScriptReference/Editor.html

Here is a tutorial to get you started:
https://learn.unity.com/tutorial/editor-scripting#

This is the UnityEditor command that can create a dropdown with enum values, such as "Dynamic":
https://docs.unity3d.com/ScriptReference/EditorGUILayout.EnumPopup.html

 

Actually nevermind, there is a much easier way. Just make a serializable (or public) enum with the values you want, then make a serialized field for that enum.