Not the OP, but our JIRA instance does this. From a ticket in JIRA, you can see ...

Not the OP, but our JIRA instance does this. From a ticket in JIRA, you can see any commits, branches or pull requests mentioning that ticket.

We also use this convention with gitflow, so our branches are named eg, feature/PROJ-1234-added-new-ui or bug/PROJ-2345-fix-new-ui. This also lets JIRA find and link them, and makes pull requests get the ticket number in their title by default as well (since its based on branch name).

The last bit is just a short human-readable thing to make branches easier to look at and find, because the initial way we started using gitflow:

    feature/
      feature/PROJ-2286
      feature/PROJ-2352
      feature/PROJ-2367
      feature/PROJ-2382
      feature/PROJ-2385
    bug/
      bug/PROJ-2240
      bug/PROJ-2323
      bug/PROJ-2393

is completely unintelligible.