How can one change a key text in an object?

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I have a list of objects I have returned from candidate_application table, which mainly contains the candidate's ID, the job ID (related to the jobs table). My aim is to use add_on to bring the title from the job table. I did that and got the below (image) but I would like to change the key title to something like job_applied_for. Any way to do this or any way to generally change the text(name) of the keys in an object ?

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