Customize default Bitbucket pull request description

We have BitBucket server v5.2.2. By default, when a user creates a pull request, there are the following fields (see the attached image):

• Title - default to source branch, mandatory
• Description - defaults to a list of commit messages, optional
• Reviewers - default to empty, optional

There is a requirement from the user community to auto-populate some standard text including links into the pull request. I thought the best way is to automatically add to the default pull request description with the standard text, in addition to the commit messages. Can this auto-population of pull request description done by? Or is there any other way the standard text to be included in the pull request.

Note that Bitbucket Cloud currently has this feature and it allows for MarkDown to be entered that will pre-populate the description field when someone opens a pull request in the repository where it's configured.