There is no way AFAIK to retrieve the mesh position from ammojs/bullet physics.
Moreover, the deformation would look like inflatable balloon mesh. And you have to tesselate your mesh enough so you get proper deformation (imagine the soda can without subdivision on the height).
IIRC, there was some open source middleware that did deformation for cars (BeamNG.drive – BeamNG )but I didn’t find it on their github.
Do you have a particular use case in mind?
I had in mind to make a small car game, and I thought it would be fun if vehicles and other objects in the game would be deformed when they hit one another, like in beamng …