Field reference within logic text

In the print view, I have an IF logic text box:

{if 'Drill Design' then
" - CS will conceive and create a drill design composition for {'Estimated Performers'} performers, consisting of approximately {'Estimated Sets'} drill sets, adhering to the specifications provided by the Client"
else
" "
end}

My problem is that the {Estimated...} needs to field references within that text.  As written above it doesn't work, ending at the first field reference.  

Is this possible?  How do I get it to work?