Definitely possible (like almost everything with TT)
I’m not with mine at the mo but I recommend getting familiar with the pattern ops to understand how they work first.
Then you can create a script which is triggered by a gate signal from your keyboard which reads the cv input from your keyboard. You may have to introduce a bit of a delay (eg ‘DEL 76: …)as the Teletype reads IN slower than triggers but this is pretty much resolved in the coming update. Set this script to add the cv value to the next index in the active pattern.
Sorry that’s not super prescriptive but hopefully gives you an idea about how to approach it!