HR Leave Of Absence

One of our HR Teams is looking to use ServiceNow to track Leaves of Absence.  Some of the requirements provided to me look to already exist within the HR Total Rewards COE.  I can also see a module at HR Administration > Leaves of Absence, which looks to be nothing more than a list of records in the sn_hr_core_leave_of_absence table.  

My question is how are records inserted into this sn_hr_core_leave_of_absence table?  I can see Business Rules that will update the status, but I cannot find anything as to how a record is added.  I've also looked at the OOB Leave of Absence HR Service. I'm not seeing anything added to the leave_of_absence table.  The closest DOC I found references the Parental LOA, but that requires the activation of plugins such as Lifecycle Events, which we are not licensed for.

Any direction is appreciated.