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Is it possible to save Canvas Render Target?

Hello. I would like to ask if it is possible to save canvas render target image when saving a game.

I have a system in my game that lets player paint a house. I am using canvas render target to do this. The problem is that I cannot find a way to save the image, and then load it when player loads the game. I tried to save a variable, and setting it at the start of the game, but it does not work. Is there a “magic node” that I am missing, or it is just impossible? Thanks in advance!