I'm not quite sure what exactly you mean by this. If that implies you're trying to backport mt76 into openwrt-22.03, then stop right there, it's not going to work sensibly. Work on master, and ideally on the bare-iron, to get the hypervisor and its quirks out of the way - only once you got that working, you may stand a chance to backport the necessary changes (just don't expect that the openwrt-22.03 branch would take these changes, openwrt-23.xy is about to branch off - make sure that this branch (via master) is working now).
6 GHz support (as well as mt7921/ mt7922) is very much at the forefront of development, a lot of bits and pieces would have to go together for it to work. On top of that I don't think any 6 GHz devices (as in plastic routers with three- or four radios, one of which happens to support the 6 GHz band) is even supported at this point, which severely reduces the chances that anyone has tested it (yes, with PCIe cards you can do a lot more, a lot earlier, but that doesn't imply anyone else has set the groundwork for it, yet - and I think there still are known pieces missing for it to be fully supported). Get your readings from the the low-level linux tools (iw) and the kernel, make sure that the generated hostapd configuration match your expectations for 6 GHz, …
Expect quite some development on netifd, iwinfo and luci to be necessary.
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from experience with mt7921un, in STA mode on general purpose linux, you want at least kernel v6.1 (respectively its mac8021/ mt76 packages) for these new chipsets to work in 6 GHz mode (and even then there's still quite some performance tweaking pending for 6 GHz), in other words excatly what's master giving you right now.