But basically I think the answer is 'no' -- there are so many different 'APIs' (quoted because often there aren't proper apis, you have to scrape, export manually etc.), that very few people attempted to unify it.
I have some thoughts on how such system could work like, described here https://beepb00p.xyz/sad-infra.html#data_mirror and here: https://beepb00p.xyz/exports.html . The export tools I wrote are the first order approximation of this vision -- seems robust enough for me so far, so now I'm working on connecting it to other tools and looking to cooperate with other people.
Basically so far I was solving the 'data import/scraping' part, but now finally starting to connect it elsewhere now that it's somewhat unified and normalized.