How to default hiring manager for all job offers

Summary:

we have a client applying position synchronization with that for job offer in recruiting the hiring manager is always will be the line manager of the position I need to default the value of hiring manager all the time for internal candidate to be fixed.

the attachment below from a client page but i have no idea how that was done any advice please.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

24C (11.13.24.07.0)

Code Snippet (add any code snippets that support your topic, if applicable):