Ability to set the Portfolio/Roadmaps Parent Link field value with behaviours

Summary

As a Jira Admin,
I want to set the value for the Roadmaps Parent Link field using behaviours,
so that I can automatically control the value when a user interacts with the issue.

Details:

Users would like to set the `Roadmaps for Jira` Parent Link field using the behaviours `setFormvalue` method.

Ideally, have it take the issue key as the value in the same way you can use the issue key to set Issue Picker fields.

 e.g:

getFieldById("customfield_10000").setFormValue(issueToBeLinked.key)