What should I do to proceed like this?
I've worked on it with
a pop grain. Is there a better way?

11 seconds of this video

I would boolean it out with a animated shape(jelly piece), and don't do any simulation. Just a jiggle deformer at the end.

Some noise displacement inside the teared area, and convert it to vdb so you can get a nice blend between glass and jelly piece. Then convert it back to geo. I hate simulation :p

If the seam in front of the glass is kinda ugly, i would render a extra render with the glass that don't have the teared piece, and just do a blend between that and the render with the teared jelly in comp.