It would really help to know what OS is currently installed (or what the highest version of macOS that was ever installed).
If macOS 12.x has never been installed on this laptop and the internal SSD does not have sufficient free space, then just install macOS 12.x to an external drive while the original Apple OEM SSD is still installed internally....this will allow the macOS 12.x installer to update the system firmware since the installer utilizes the internal SSD for the system firmware update (just a very small amount of space is needed). After the macOS 12.x installer has been installed, the system firmware will have been updated. Now you can install the OWC SSD internally, and successfully install macOS 12.x once more, but this time to the internal OWC SSD.
I guess if you have an OWC Envoy Enclosure that is compatible with the new OWC SSD, then you could just install macOS 12.x to the OWC SSD while it is connected externally (the original Apple OEM SSD must be installed internally at this point). Afterwards, you should be able to swap SSDs and boot the OWC internally just fine. Just make sure the OWC Envoy Enclosure you have is actually compatible with the OWC NVMe SSD....older models of the enclosure were not compatible with the OWC SSD and would damage both the enclosure & the OWC SSD.
If macOS 12.x was/is installed, then just install the new OWC SSD and reinstall macOS 12.x since the system firmware should have been updated with the previous install.