Customize color in map legend

I’m trying to customize legend colors based on my choice while showing dots by selecting disaggregated using specific column.

Can anyone help me to know how can I can customize legend colors in map based on my choice.

Welcome to the community, @aajoarder! Could you also let the community know what you expect with the label? A sample would be helpful to understand your requirement pictorially. Maybe the community should be able to help you if possible.

How can I customize the color of legends?
Example : I would like to show my legends as

A= Green
B= Yellow
C= Orange

Red means the score is poor and health centers need intervention to improve their facilities.