Apply soft body & collision for dae imported object


Im a blender beginner. Lately I’ve done research on applying physics for a rendered model. I have 2 questions.

  1. My model is exported from a game as dae file and imported into blender. Im trying to apply soft bodies for the model, but there s no option available in Physics tab.

  2. I want to apply collision and soft bodies specifically for the chest and and butt, how can I do it ?

Thank you in advance

Which version of Blender are you using ?
And would you mind sharing your .blend file ?

Im using blender 2.9. I attach the file here, with separate textures for solid and glass meshes.