This link
on this site says to contact the Community Council via ML. I suspect you’re already aware of that (it doesn’t mention discourse; ~Q1), but I’d probably still include ML (Q2 maybe) as an option.
The link
https://ubuntu.com/community/governance#community-council
links to Community Council Meeting Agendas & Schedule which says to add agenda item to gain Community Council attention.
You can nominate items for discussion by the Ubuntu Community Council by posting to the current meeting agenda topic here in the Community category of the Ubuntu Community Hub. Nominations to the agenda must be made at least 24 hours before a meeting.
If I find more, I’ll add here