In addition to hooks, what other better ways are there for crystal lamps to retreat?

There are ways to remove blue and green backgrounds in video software (just drag a special effect). When the background is blue-green, you can directly remove the blue-green background color, but you can't export it as a PNG map (tell me what you know). You can only change the background in the video software, so you can export it (the highest map is 1920* 1080). I wonder if it meets the requirements? Crystal lights blue and green basemaps have never been tried. Besides cross-checking, is there a better way to copy the bottom (if so, please tell me)