It's not clear to me what you want, since your code is wrong.
Here the correct analogous:
$ref->{foo}{$bar}
(NB: autoquoting of key "foo" !)
is
demo in the JS console
>> ref={foo: {x:42}}
Object { foo: {…} }
>> bar="x"
"x"
>> ref.foo[bar]
42
>> ref['foo'][bar]
42
as a side note, $ is a legal identifier in JS so you can also write
>> $ref={foo: {x:42}}
Object { foo: {…} }
>> $ref['foo'][$bar]
42
update
demo in the Perl debugger
DB<3> $ref = {foo=> { x => 42 } }
DB<4> $bar = "x"
DB<5> p $ref->{foo}{$bar}
42
DB<6> p $$ref{foo}{$bar}
42
update
DB<11> use experimental 'refaliasing'; \%ref = $ref
DB<12> p $ref{foo}{$bar}
42
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