Creating a custom HCM extract and use it as a DBI inside Oracle payroll formula

Summary:

I know that the HCM extract is generating formulas for each row and it can be called from payroll flow to make outbound file integration.

I also know that there is standard DBI for the seeded extracts that i think can be used in the payroll formulas to do some logic as an array.

So my question is, can we create a custom extract and create DBI based on it to be called inside a payroll formula.