DJI Goggles N3 does not have an HDMI port and, therefore, does not support direct HDMI input or output. However, if you have a DJI RC Pro, you can use it to relay the signal. Connect Goggles N3 to the RC Pro via a USB-C to USB-C data cable, and connect the RC Pro to another display device via an HDMI data cable. Then, enable the FPV Live feature in the Settings > Display menu on the RC Pro. Open the DJI Fly app, and you can then get live feeds from Goggles N3 on the connected display device via the RC Pro.