Using *DebugLib* instead to print a message, I was able to confirm that my driver is now running properly:
*cat debug.log | grep Hello*
This works both when adding it in the OVMF build and also when inserted by UEFITool.

The drivers is not being listed by the EFI Shell *drivers* command.
This is expected to me as Dxe Drivers are unloaded after they return.
Nonetheless, the same is happening when I package it as a *DXE_RUNTIME_DRIVER*.
What is it that I'm missing?

Thank you for your attention,
Diogo