I can complete this with post-function but post-function uses reporter as where the comment came from.
I am looking to have automatic comment added once issue is created.
Who do you want the comment author to be if it's not the reporter of the issue? That might affect your approach here.
Also, I don't know if you're on JIRA server or cloud - add-on recommendations depend on that because not all add-ons work for both Server and Cloud.
That said, if you're on JIRA Server, you might be able to use the Automation Lite add-on for this. This add-on allows you to create automation rules - basically, the rule takes some JQL and a cron expression to know how often the system should run the rule. When the rule is run, the system applies the same action to all issues found in that JQL query.
As an example, we use this add-on to comment and transition issues to a "Closed" status if the issues haven't been updated in the past two weeks. In your case, you could have a rule set up to run once every 10 minutes (or however often you want) to leave a comment on new issues automatically.
There is a paid version of this add-on that appears to be compatible with JIRA Cloud, but I have never used it and can't attest to its functionality and features.
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