Change combined number bar chart legend colour

I am trying to change the colours for my legends in a bar chart on my dashboard that was created by combining tow big number questions. I currently see no way to change the colour of the bar from dashboard and since this itself is not a saved vizualization/question I cannot edit the settings. I feel this is linked to Colour changing in bar chart
but cannot find these options when combining two big number questions on my dashboard

Hi @ChristineChetty
There’s an issue open about allowing more formatting options to combined cards: - upvote by clicking :+1: on the first post