When user has too many mods in their modpack (been there, done that) it's great they can generate resources by using the command ingame - but it can be a pain to rewrite them all. Solution would be some type of config based rewriter for PMMO that literally just rewrites all items, blocks, etc.. in correct format with correct information.

It should probably be side project.

It may sound like a hell lot of extra work, but I spent last three days working on simple version of this and am almost done. I will soon update on GitHub and don't really care for using it further than my project... So if you'd like I can link that somewhere or something.

Have a nice day :)

I just added my first version on my github, it's unlicensed, so feel free to use it if you want. I litterally spent less than five days on it whilst taking care of my daughter, and I'd say it looks that way - but better than nothing :)

If I understand this correctly, you are looking-for/building a tool that allows users to script configurations in order to automate certain aspects of the datapack creation?

Yes, pretty much. I was looking for something like that, but couldn't find it - so I am building my own. For me, it will be useless after I balance the values.
So, if you want to take it and make it better, I wouldn't mind. It's not very foolproof, and I am almost done with all I need from it - so you can take all the credit you want after modifications. I just need to finish the blocks changes and test it, then I will upload it to github or somewhere...
I just really like PMMO mod idea, so I think it should be more accesible :)