How do I request an issue to be moved to the paid issue queue when I did not create the issue?
At this link it says send an email to info@civicrm.org: https://civicrm.org/about/core-team
It also says you can hire any of the experts.
On the particular civicase issue there are a couple tangled up issues with closed cases (https://lab.civicrm.org/dev/core/-/issues/1401) but maybe this one (which is listed in there) could be dealt with without getting too tangled. I have it on my own todo list to someday look closer at the proposal referenced in there about the more general issue, which may or may not intersect with this one.