The threshold issue here is: "What do you mean by 'jazz' "? Ellington, Mahavishnu, Wynton, Alice Coltrane, Keith Jarrett, Sun Ra, Sinatra? And are you including boots?
But here's my two bits: In the 1970s & 1980s, I collected a lot of mind-bending "Rock in Opposition" music that combined jazz, classical chamber music, electronics, and sometimes even heavy metal. Lots of Chick, Zappa, even Yes influences. I also traded Western CDs, with penpals in the Soviet Union and Eastern Europe, for some more conventional jazz records by world-class artists who are little-known here.
I can make a few recommendations. A good first stop would be Komeda's "Astigmatic," which -- and this is admittedly a poor analogy -- is something like Eastern Europe's "Bitches Brew." Tomasz Stanko is no Miles, but still great. It's on Tidal, & you Google Komeda for context. Like Miles, he used to collect young talented players and guide them to become great bandleaders in their own right (when he wasn't recording soundtracks for movies like "Rosemary's Baby").
A good place to start for the RiO releases is with the bands Art Zoyd, Univers Zero, and Zao (the French band with Yochk'o Seffer & album "Z=7L" -- there are a lot of Zao's). Their albums are extraordinarily diverse and often experimental, but you may hear echoes of Weather Report & Pere Ubu. Again, you can find a smattering of these artists' huge catalogs on Tidal. Another option is Cuneiform's glorious sampler album "Enneade", which is also on Tidal (Youchk'o's "Freya" track is pretty hot!)
This is a whole world of jazz that is generally unknown to Americans and most younger Europeans.
Oh, and there are East Europeans who have released a only few albums here, but who have huge catalogs of great records that never made it to our shores. YouTube is sometimes the best (mid-fi) way to sample such artists, like Michael Urbaniak and Iva Bittova (the "Polish Laurie Anderson"!). I see a newly remastered version of Urbaniak's fusion-y "Inactin" is on Tidal.
