I did an extensive search about a year ago looking for any type of zoom lenses for any type of drone, more so DJI. I couldn't find a single solitary thing over a full 12 hours of searching the web.
I think zoom lenses would require glass or thick plastic, which would be too heavy for the gimbals. The gimbals are made to such specs that they barely can move the camera they are designed for. Really thin lenses with light plastic work fine, but anything heavier, it's not gonna work. Zoom lenses are inherently heavy. They just will weigh too much for the gimbal.