This workaround is meant to help projects where it is necessary to assign a new issue/request directly to a specific agent to better organize the queue management.
For a such scenario, I used ProForma with Automation For Jira(A4J). Also, I used as an example a form related to an IT - Change request, where the customer will select in a radio buttons fields the option of IT change. For which option chose the new request will auto-assign to a specific agent. This method can be used for other purposes (eg. issues with approvers).
Note: Because ProForma updates the issue and linked fields with a milliseconds delay after the issue is created, when more information a form has, more "Re-fetch issue data" actions will be necessary to add so that this delay is rewarded and the automation rule can get the form values.
Note: To find the custom field ID please take a look at this documentation. Also, to get the ProForma proprieties you can access it using this URL below: