That doesn't make a huge amount of sense. At that level Linux hasn't loaded so there's no driver to run.
I presume the reason is to edit UEFI settings, and that's generally fairly niche as *hopefully* the system should work as-is. Stuff such as UEFI boot parameters can be edited within Linux itself or via something such as SuperGrubDisk.
If it is necessary to edit all the UEFI settings, right now, one possibility is a motherboard that supports serial/web interface etc that could interface to pre-existing screen readers.
Unless you're expecting UEFI to intercept and read all graphics at any point, in which case : it doesn't work that way.