You just don't bother trying to adapt solutions given to you.

my $d = Dumper $hash;
my $somanyspaces = ' 'x10; # how long is your string?
# add to all lines whitespaces
$d =~ s/^/$somanyspaces/gm;
# add to first line your string
$d =~ s/^$somanyspaces/I am lazy /;
print $d; # now indented
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