Sorry for the confusion.
Actually, GOBO was already supported in rekordbox lighting. You will be able to use GOBO without any issues.
However, the lighting fixture itself is not supported by rekordbox lighting. "Effects (1)” is shown in the rekordbox lighting screen like below. This means Effects type category itself is not supported by the current version of rekordbox lighting.
Sorry for not meeting your expectation and thank you for your kind understanding.