Yes, TOSEC is open to submissions like this. There are already some TI-xx Firmware dats in our set and no one would object on adding more. Scope of the project is to add any available undatted ROMs.
There's no active maintainer for the TI series right now AFAIK, so if you would like to create a dat for them or even become a full member of TOSEC and start maintaining TI stuff, we can go ahead. Or if that sounds like too much, I would be willing to dat them, assuming you can provide some additional info to ensure naming accuracy (my familiarity with these systems is 0). I also suppose these files can be found publicly somewhere, as TOSEC (unlike NoIntro and Redump) prefers to only catalog files that can be found in the wild and are not limited to private groups (like some SPS dumps) or MIA (like some of the Redump stuff).