Check if a Confluence Page is linked before transitioning Edited

[Abhinandan Shah]

Hello, I have Jira Cloud and Confluence Cloud apps. 

We use Jira for all actionables and Confluence for all documentation.

Business Problem: 

We need to enforce that a confluence page must be linked with implementation details before a story can be closed.

Problem:

I am not able to find the field which has the value of the Confluence page.

I know the following solution that cannot work for me:

1. Add a custom URL field