I'm not sure whether this guy make a map or port it from DAZ, maybe
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is the one. Not all of his mods are free as you can find them at Discord server but most of them are gorgeous.
The other one is
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, he's porting not only map but some of his map are pretty good.
I think only those two who always post a free map in the Discord.
Maybe VNGE. AFAIK it capable running your own phyton code. It's a plugin that can be used to make animation and more convenient features. I'm more leaning toward the animation side and most people find it hard to use and using Timeline instead.
VNGE is included in the repack, but it's not pre-installed. You can find it in the folder with [Optional] in the root folder,
not to be confused with Optional Studio Sideloader Modpack. But it's not the latest version, so you might want to
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it.
I think you will find it hard to learn as no one really using it or using it specially. Resulting its unlikely you will be answered if you asked in the Discord, but you can ask
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for in-depth question. He's a contributor in VNGE project.