I'm wondering if its possible to get the identical shade of light green that admins normally get without any mods/plugins?

I cant find a list of available colours which is why I ask here! :D

I'll answer my own question.

This document shows list of colors available & the possibility to use a hex: https://docs.unity3d.com/Packages/[email protected]/manual/StyledText.html

Then I found the default hex colours for Rust admins & others:

Defaults:

• Player: #55aaff Color Hex
• Admin: #aaff55 Color Hex
• Developer: #ffaa55 Color Hex #FA5