How would I make Multicolored Bot Chat?

So I want the text in the chat so the "[Bot]:" text is red and the "Hello" text is white. Im not sure if this is possible, maybe if I use string.sub?

For example; Color = Text:sub(Color3.new(1, 0, 0);,1,6),Text:sub(Color3.new( 255,255,255);,6)

game.StarterGui:SetCore("ChatMakeSystemMessage", {
			Text = "[Bot]: Hello"; 
			Color = Color3.new(0, 1, 0); 
			Font = Enum.Font.SourceSans;
			FontSize = Enum.FontSize.Size18;
})