Describe the Addition

1. Would be good to allow "skipping" of JSON model variants rendering and render sometimes "default" variant. This will completely skip JSON model rendering and let default rendering do it.
2. Allow defining variants distribution. Say, I want that "blue" mob variant to appear much more rarely. If implement "skipping", include also the weight of default mob rendering.

Example use-case:
If I have a mod that already adds variants for certain mobs (Quark pig/cow/chicken), I would like 50% of mobs to be rendered by default (and get variants by Quark), and the other 50% are rendered by the JSON model (for example, by the Dani's Livestock Revamp). (This can be easily set up and tested, and I never get the default model, always JSON one.)

Please, can I have such feature? Or, if it is already available, please help to add it into my resource pack.

Screenshots and Videos

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Additional Context

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