Why can't you make a layout rule based on a lookup field?

Why can't you make a layout rule based on a lookup field?

Hello :) 

I am wanting to build a layout rule based on the selection of a lookup field. I have 3 fields that I want to hide for all options, but only show one if the lookup is one of the 3 options needing the extra field. It doesn't seem to give me the option of using that field as a condition in the rule. Is this true? 

Thank you