There is indeed and was even made more accessible and with copy button in the last version.

However, if both payer and the payee use the Minibits mint, it settles invoice internally - in those cases preimage is missing.

https://image.nostr.build/b9d0cab624176e21dda65db77e78f82621dc2ef4e21f059ff821da5678d9674b.jpg