Feature description

Hello!
I am using Buy and Sell signs for my server, but currently I am using Dark Oak Signs which are very dark.
Therefore, I would like to color the text on the signs (e.g. White) to make the Sell and Buy Amounts and prices more readable.
I tried with dyes and I tried with &f color codes for example, but it makes the Essentials Buy/Sell Signs invalid.
It would be amazing if this could be added and I would like to thank you in advance for the help! 😊

How the feature is useful

This way, server owners and admins can start using dark colored signs like Spruce or Dark Oak Wood for their Buy/Sell signs, e.g. when using white text.
Moreover, it could allow for more fancy buy/sell signs where for example the amount and price is displayed in green on a sign.
There are various possibilities if this feature could be added.

Example image to show the problem:

Eventually, one could change the text to be white automatically in case of a Dark Oak Wood Buy/Sell sign, if that is easier to make :)

I think this would need to be configurable, setting different signs to a specific color is a bit too opinionated.