How to interpolate hashes in double quotes under Perl

Just like we can interpolate scalar variables and arrays in double quotes, why can't we interpolate hashes in Perl.

I always had this question until one day I decided to find the solution and understand the reason.

Reason: http://dev.perl.org/perl6/rfc/237.html

Solution (silly): https://github.com/paragkalra/my_scripts/blob/master/perl/hash_interpolation/hash_interpolation.pl