No. One should choose the delimiters based on what they are wanting to avoid having to escape. If we used them only with {} then we would have to escape {} every time. Best to pick something else:

my $string = q/{(foo => "'bar'")}/;
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L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)