Customer invoice payment status information through API

It seems the both the /accounting/customers/invoices & /accounting/customers/invoices/{invoiceId} API endpoints do not return a field with the invoice's payment status. The samen endpoints for provider invoices actually do.

Was this left out intentionally? And would it be possible to include this information in the response?

I know it's probably possible to get this information through a macro, but it's so much easier and cleaner if it could be included in the response, just like with the provider invoices.