I rarely make named branches these days. Just use JJ git push -c, which creates a branch name based off the change I'm pushing
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I have not gotten there yet though
The jira cli util I used, go-jira, hasn't been updated to use the new Atlassian APIs, and I haven't spent too much time looking for a replacement.
https://github.com/paradox460/dotfiles/blob/main/dot_bin/exe... - This creates PRs based off a few different approaches, the -c flag lets you do nameless branches
https://github.com/paradox460/dotfiles/blob/main/dot_bin/exe... - is the one that would fetch tickets from JIRA and make new branches off of it