You can never get anymore resolution than originally exists in the captured footage. You can export directly from a clip in the browser, but it can be a bit flaky. It's better to make a Project that matches the resolution and frame rate of your raw footage. Then put in short clips containing the area where you want to export. Go frame by frame and find an image without motion blur. Export as .TIFF or other format (not JPEG). If you need more resolution you'll have to use an A.I. Upscaler after export.