how to have more than one chat color on ChatMakeSystemMessage core?

game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage",{ --Getting "StarterGui" and calling the function
Text = "[SERVER] Hello!";
Color = Color3.new(255/255, 215/0, 0/0);
FontSize = Enum.FontSize.Size24;
})

I was using this code to add a server broadcast script, but the entire text is yellow, and I want the name of [SERVER]: and the text to be 2 separate colors, how can I do that? Thanks if you do help!