This are standard systemd service file syntax and standard systemd directives. Quadlet forwards everything but the [container] section directly to the generated service file.
The generator doesn't do that atm no. Seems like it would be useful though.
On the other hand, I belive systemd would load override files for the generated .service file, although those can just override details on the systemd level, not the generated podman command.
This has:
Seems nice.