Often the performer is not the composer.
You may include the performer (version) with the song title.
Please use correct iRp chart-info format.
Example:
All Of Me (Sinatra) - Gerald Marx
...title......(version) - composer(s)
Composer name(s) are not enclosed in parentheses "( )" in iReal pro.
Parentheses are used for describing performed-by versions as part of the song title or to clarify an ambiguous title because many different songs can share the same title.
You can certainly lay-out a 3/4 chart with 3-space measures, but it's not necessary.