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my @menu = ( { -label => 'File', ... ] }
my $menu = decode_json( path( $jsonfile )->slurp_raw ); my $funcname = $menu->{menu}[0]{"-submenu"}[0]{"-value"}; my $funcref = $callback{$funcname}; $menu->{menu}[0]{"-submenu"}[0]{"-value"} = $funcref;