Does it exist a solution in the market that can be used to change a
hollow core door to become a solid-core door?

If all else fails, drill a hole in the top, pour in a couple quarts poly
glue followed by a cup of water, then plug the hole right away. The glue
will expand to fill all existing voids and once that is done it'll create
some new voids. Once the glue dries, trim any outflow with a chainsaw, axe,
or hammer chisel.