The WiFi 6e cards you could try are the AX211, AX411, Killer AX1675i or Killer AX1690i. Now, these are CNVio2 cards and your system has CNVio support. Jury us out on whether these are compatible - and the implementation by your vendor can make or break this, so follow Al's advice and talk to Asus support.
So, what would you like us to do? As Scott said, we do not know if the wifi 6e cards are compatible with your board or not. So, how can we recommend one? If we did, and it did not work, what will you do?
I am sorru that ASUS refuses to help you, But, they would know if CNVio2 cards will work on their board, or not.
You may want to try using the ASUS forum, and ask there. If it were me, I would not purchase ASUS boards ever again for their failure/refusal to answer such a question
Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]