We knows the cubase 15 released a SVS internal plugin Omnivocal - a vocal revolution | Steinberg, and it’s allowed user directly input note text in the piano roll, I am not sure did we have any plan release the feature into VST SDK for thrid-party plugin developers?
Inside Cubase we are using an internal private interface with Yamaha.
At ADC 2025 there was a presentation of a preview of ARA 3, which will be extend to Random Access to Event like MIDI. Steinberg is part of the specification team.