Yes—what you’re looking for exists, but typically not as standard “lighting gel.” Circular polarization requires two elements: a linear polarizer plus a retarder (wave plate). That’s why camera circular polarizers are more than just a simple polarizing sheet.

For lights, you generally won’t find this as ordinary gel stock, but it is available as optical film/plastic from specialty optics suppliers, including left- and right-handed versions. Flexible film versions can be cut and used somewhat like gels.

A standard linear polarizer gel alone will not create circularly polarized light. To get left- or right-handed circular polarization, you need the proper circular polarizing optical film assembly.

Also, the reason camera circular polarizers are common is that many cameras use polarized light internally for autofocus/exposure systems, and a purely linear polarizer can interfere with those systems.