After extracting and looking through the files, i've found a way to add custom skin and hair colors to the custom races(custom human, custom lizard etc.).
Here's how:
-First, extract the shared.pak and all of the patch.pak files including the hotfixes to get the latest possible relevant files necessary for this to work.
-Next, fire up divinity engine 2 and create a new project(named mine colors).
-Next, save the project to create the mod folder in your game directory/data/mods
-Navigate to the extracted files Mods\Shared
-Copy the CharacterCreation directory over to your mod directory
-Delete all directories except RacePresets
-Enter directory and open raceyouwanttoedit.lsx with your favourite text editor(recommend notepad++).
-Find entry <node id="SkinColors"> or <node id="HairColors"> depending on wether you want to add skin or hair colors
next copy 1 of this section within the file under the skin or hair node, then edit according to the explanation below.
<node id="ColorDesc">
<attribute id="ID" value="13" type="5" />
<attribute id="ColorName" value="Biotite" handle="h156c50begd220g4c63g9f0dg95b656de69b7" type="28" />
<attribute id="Value" value="0xff303032" type="5" />
</node>
<attribute id="ID" value="13" type="5" />
In this section you need to edit the value. Make the number 1 higher then the highest one amongst the colors(in my case the new number was 14, the next one would be 15).<attribute id="ColorName" value="Biotite" handle="h156c50begd220g4c63g9f0dg95b656de69b7" type="28" />
Here, you will need to edit the value, which will determine the color's name during selection(this can be anything you want), and the handle. With the handle, just select some of the numbers and characters and replace them with random ones. Make sure that the new handle doesn't match with any of the other ones.<attribute id="Value" value="0xff303032" type="5" />
Here you will need to edit the value again, you need to leave 0xff in there. Next, look for an html color code picker online, find the color you want, then paste the code in after 0xff-Save.
-profit.
Still need help with finding template uuids please.