Hi Team,
I have a list of release versions set up in my JIRA Project. They contain a name, start date and due date:

I have created a plan where I am assigning a fix version to an epic issue type.
My question is - Is there some automation to automatically add the 'Start Date' and 'Due Date' to an Epic, when the Fix Version is populated? For example, when the fix version is set to 'BOH-24.2', the Start Date is set to 01 Apr 2024 and the Due Date is set to 30 Jun 2024, as set in the Releases in the image above:

The automation I have attempted to create is below. When a fix version for an Epic is updated:

Then, set the Start date and Due Date field. I'm wary that advanced field editing using JSON or smart values are probably required for this. But I don't have the knowledge to be able to create this myself. The Start Date and Due Date values should be copied from the Fix Version.
I would really appreciate it if anyone can shed any light on how to get this automation working.
Thanks for your help.
Chris