Hello Jim, welcome to Jmol!

You cannot get the circle (although it could be drawn with some
imagination),
but you can have Jmol display "aromatic" bonds, that is one single + one
partial (dotted)

For example:

load $benzene;
connect (_C)(_C) aromatic modify;

but it's difficult to get the dotted bonds all inside, as one would like

More generic:

load $toluene;
select within(smarts, "c1ccccc1");
connect aromatic modify;

load $orcinol;
select within(smarts, "c1ccccc1");
connect aromatic modify;

load $aspirin;
select within(smarts, "c1ccccc1");
connect aromatic modify;