Text Colour in All Visulisations

Simply the ability to allow users to change the text (x&y axis) colour like you are able to do on the likes of the simple stacked/clustered bar charts. Seem's odd that this simple functionality is available on only selected default visualisations. Simple visual displays are currently not possible for what I am trying to achieve. With the new update to allow images set as backgrounds, I would like to set all visulisation background colour's to black. This is not possible as you are unable to read X & Y axis data as unable to change colour.