how to simulate IR vision in Unreal engine

I am trying to create synthetic data with unreal engine. I want to fly a drone(with AirSim or anything else) and capture IR images. as its for teaching a neural network, I need a real good IR vision images. I mean just a texture with red color and orange color respecting the corners(like another tutorials in the net) is not as good as I want. AirSim it self has a IR vision but its something like grayscale and its not good as it should be. can you please Help me doing this :)?

No difference, UE4 or UE5 or even unity! I just need the simulation (even in paint :D)

I was thinking about setting a variable Temperature for every single object in my scene and using this to convert the RGB to IR but idk it is good or not. also if you know some material or object available in the market that will capture IR vision images it will be nice if you tell me about it.

Not sure if this is still a issue but there was a nice plug in released for unreal engine that can help with this: https://www.fab.com/listings/7e781305-8e5e-4131-8af3-cc9b7e7a998f