Entity model can't be selected for living entity

Status
Works as designed
Issue description

I'm trying to use the Turtle model from vanilla Minecraft in MCreator, and importing it worked fine, but it just doesn't appear as an option in the list of entity models when creating a Living Entity mod element. I imported it from the Bedrock version of the game as a .json file. I noticed that under "Entity Model" it says "Supported: JAVA", so does this include .json files which are technically a type of Java file?

(Turtle as a built-in model would be nice too)

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