Firstly, it's important to clarify that there's no out-of-the-box feature in Confluence or Jira that directly allows a Confluence form to subscribe a user to a Jira filter. Jira filter subscriptions are typically managed within Jira itself, where users can subscribe to filters they have access to for regular updates.
Possible Workaround
Link to Jira Filter: A simpler, more straightforward method would be to include a direct link in the Confluence page/form description that takes the user to the Jira filter. While this doesn't automatically subscribe them, you can add instructions for users on how to subscribe themselves to the filter in Jira. This method is transparent and empowers users to manage their subscriptions.
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