Help with exporting lossless footage in 4:4:4 color format

I have some lossless video I want to edit. And I want to export it in lossless format so that I can keep a 100% exact copy, and also re-encode it later using ffmpeg.

When I select one of the lossless export options and render, the final video has the 4:2:2 color format and not the 4:4:4 color format like I would expect, preserving the fine color detail. This is very important for preserving high quality in screen- and other digital content.

How can I render losslessly to 4:4:4 color format?