It's all part of the rear body harness. There is a connector behind the driver side kick panel. The harness runs along the drivers rocker panel, down back by the driverside rear seat and enters a trunk. The dome light connector should be just inside the trunk behind the rear seat on the drivers side. I'd start by disconnecting the connector behind the kick panel and reinstalling a fuse. If it doesn't pop then take the fuse out, plug the connector back in and disconnect the dome light. Then reinsert the fuse. If it doesn't blow then the short is located in the tail light harness beyond the dome light connector.
Here's is the main rear harness in the background.
View attachment 1715369689
And the dome light connector behind the seat
View attachment 1715369691