Make a part of an expression bold

[#1]

I have this expression:

=Max(Year)  &    '  '  & num(sum( {<Year={$(=Max(Year))},Month={"<=$(=max(Month))"}>} Sales),'#.##0')

I only want the first part of the expression to appear in bold. I don't see anything that helps in the formatting functions, is this still possible in some way?

[alexandros17]

I think it's not possible to make bold only a part of an expression, in text format you use '<B>' to make bold the whole expression.