access values in array of hashrefs

my $HHs=[
{Rx => 'test', key2 => '1st second key' },
{Rx => '2nd1', key2 => '2nd second key' },
{Rx => '3rd1', key2 => '3rd second key' }
];

say join(', ', @{$HHs->{Rx}}); # say all the values of the 'Rx' key in each element of @$HHs.

Is there an easy way to do what I want here?