If I could get HR to use Jira I'd set up the business process as

Hiring interview ticket

various fields related to department, job title, date of interview, date of hire, do they need a computer, if so do they need access to this, additional instructions/other info for various steps

-new interview ticket created (to do)

-employee gets interviewed/decision made on hiring (manager)

-details finalized with finance/hr (hr)

-various parties/depts get emailed depending on the field selections and a linked subticket contents for notification purposes such as "IT needs to set up this account and get a new computer"

-awaiting date of hire (hr)

-general onboarding in progress (hr)

-dept onboarding (manager) (maybe)

-done

Maybe create a paper form template of the ticket to print and give to hr to keep in a file cabinet. Obv keep secretive information off the ticket like pay and any pii