Take a look at the knowledge base article Importing data from Github:
The Github importer is no longer supported by Atlassian, but you can still import data with a CSV file. Check out the Atlassian Community to find tips and tricks from other users who've done it successfully.
I haven't seen any plans to re-introduce the importer at this point. One thing you can do is submit a Suggestion on JAC. Once you do that post the link here so the community can vote on the issue.
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