First of all, create a planned patch to increase the number of fragments. According to your needs, I will do a few less here.

After adjustment, it becomes a polygonal object.

Enter the point editing mode and adopt the method of alternate selection? As shown in the figure, click

After selection, click the Connect Link button to connect points, and the result is shown in the figure below.

After the connection, add the turbine smoothing modifier to the Modify menu.

Return to multi-point mode and check the show results button.

Click the Stretch Stretch command? As shown in the figure, adjust the extrusion depth and opening size to adjust the state of the soft bag.

result

At this point, return to the turbine smoothing modification menu and increase the parameter to 2 to make the model more round.

Put a ball model according to the size of the hole and flatten some buttons as soft bags? The result is shown in the figure.