You'll need to implement a loop step in your Zap before the Twilio step to loop through all "to" phone numbers and the respective "val" that needs to be sent as a message.

There's a guide on implementing looping here: https://help.zapier.com/hc/en-us/articles/8496106701453-Loop-your-Zap-actions#h_01HME0XPHPAMF4BQ4A6KH9D645.

Ideally, there will be one loop iteration for each phone number and the respective val, which you can then map into the Twilio step (the guide covers this too).