Yes, it is possible. The important thing is to size (choose) the soft starter so that its rated current is greater than or equal to the sum of the rated currents of the motors connected to it in parallel. So if I have to start two motors in parallel, one 5A and the other 15A, the soft starter must have a rated current of at least 20A. They do not necessarily have to be motors of the same size. As far as the thermal protection of the motors is concerned, the soft starter cannot take care of this, as it would interpret them as a single 20A motor. They must therefore be protected individually, e.g. with two overload relays or other equivalent solutions.
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Choose from LOVATO Electric soft starters:
https://catalogue.lovatoelectric.com/gl_en/Products/Soft-starters/CAP05/pc
See the tutorials on soft starters:
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