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use strict;
use warnings;
...

my $perl = from_json $js;
print Dumper $perl;

$VAR1 = {
          'contactsData' => [
...
                                'm_UID' => '963',
                                'm_lastName' => 'ROWLAND',
etc...

my $perl;
$perl->{contactsData}->[0]->{m_note} = '';
$perl->{contactsData}->[0]->{m_display_name} = 'Lynne';
$perl->{contactsData}->[0]->{relationship}->[0]->{m_relationName} = 'R
+OWLAND';
...etc