I don’t think Unity’s JSON can do anything except concrete types.
Problems with Unity “tiny lite” built-in JSON:
In general I highly suggest staying away from Unity’s JSON “tiny lite” package. It’s really not very capable at all and will silently fail on very common data structures, such as bare arrays, tuples, Dictionaries and Hashes and ALL properties.
Instead grab Newtonsoft JSON .NET off the asset store for free, or else install it from the Unity Package Manager (Window → Package Manager).
Also, always be sure to leverage sites like:
For future reference, photographs of code are not a thing. If you post a code snippet, ALWAYS USE CODE TAGS:
How to use code tags: Using code tags properly