Missing "Payment Duration" options in Sales Order's "Recurring Invoice" section

There is a field called Payment Duration with the below options:

If you go to cron/modules/SalesOrder/RecurringInvoice.service you will find:

There are additional options in the function that creates invoices. But those can't be used because the field only has a subset of them.

It would just be a matter of adding the missing options: net 01 day, net 05 days, ... net 15 days

I would even suggest having a regex to get the number between net and day(s) to make it more general and being able to add custom options in the picklist that would work right away.