Saving a chosen colour

Someone asked this question before, but it was never really answers so I’m asking it again.

Is it possible to save a chosen colour, once you have created it by entering the relevant HEX number in the dropdown box which offers a “Picker” after you’ve clicked the “Select text colour > More colors” button over a post? Yes, the new choice is saved momentarily as the default colour, but it is lost the moment you select any other colour (I use <span> commands quite frequently). So the next time you need the custom colour, you have to click through the dropdown options and re-enter the HEX code.

If it isn’t currently possible to save a chosen colour, as described, is it possible to put in a request for a save routine to be added to the text colour tool, please?

Thanks.