I wanted to jump marbles through hoops after seeing something similar in a different brand of marble track.

This koop plugs into the Gravitrax Hammer base and can be used on 'infinity' tracks where the marbles loop around via a marble lift. The short video below shows how it can be used with a ramp and catcher - https://youtu.be/apzJLcZE2xA

This design is an original and was made on made in Tinkercad - https://www.tinkercad.com/things/dCqJ6dbSjEf