JQL Tricks plugin (paid) has a slightly polished version of the query to find issues that are commented by specific user or issues on which comments were added on or after specific/relatives dates.
You can use comment as a searchable field in JQL. if you are searching for the term "ABC" in a comment, use this:
comment ~ 'ABC'
However, beaware you should try & restrict the search to a project, issue type or category otherwise it could search the index for every comment in your Jira would could be quite slow
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