You should take a look at this post by @SirPigeonz, in my eyes it is possible you are searching for something like this:
Direct-Download with this link:
https://github.com/SirPigeonz/Shortcut-Composer/archive/refs/heads/pick-color-sampler-blend.zip
It is an extension or mod of @wojtryb’s great new plugin “Shortcut Composer”, what can be found here:
& here:
Direct-Download with this link:
https://github.com/wojtryb/Shortcut-Composer/archive/refs/heads/main.zip
Are you looking for something like this?
Michelist
BTW: Actually, your feature request is quite meager, but considering the good comprehensibility of this wish, and the fact that there may already be a suitable solution, it is to be gotten over.
Add/Edit: Another idea would be to use the scratchpad in combination with the “Docker under Cursor”-Plugin. With scratchpad, you can mix colors, create temporary palettes, if you want to, and the DuC-Plugin is able to call the scratchpad docker and open it where your cursor is, so you can grab or mix colors.