Yea, I have that mate, you mean the file inside (settings) called (fm-widgets settings.xml) its the only one I can find with so many settings inside of it.
I also found this for 1 example:
<colour name="fg accent" value="rgb(106,217,225)"/>
That RBG code is for the Cyan, but I changed it and nothing happened. Also that 1 RGB code is the only one for Cyan, only others I found were like this:
<colour name="fg cyan lighter" value="cyan 200" />
<colour name="fg cyan" value="cyan 300" />
<colour name="fg cyan darker" value="cyan 400" />
And I changed the (cyan 200) for example to an RGB color but didn't work, so I am lost how to change it now lol.