We would like to make a decision on merging the pull request based on the response from fortify source code inspection tool. I am not sure how this can be done as a developer with no knowledge on atlassian administration.
I haven't used Fortify before but I can see that there's a bitbucket pipeline integration for Fortify Scan.
You first need to create a bitbucket pipeline that triggers on pull request and then add Fortify Scan integration.
Configuring bitbucket pipeline