How to use eyedropper to create custom color?

I want to use the eyedropper tool to pick a color from an image, to use it in my custom color palette, e.g. to give the lining of the image a color that matches the image well.

I think this is not a feature of Libre Office and I miss it a lot!!

How do I make a request to develop this function into the program?

Greetings
Floris