Syntax::Feature::Ql is close to what you want. It gives you a quote-like operator ql such that:
use syntax 'ql';
use Test::More tests => 1;
my $greeting = ql{
Hello
World
};
is($greeting, q{Hello World});
Following the same technique you could create a quote-like operator which trims whitespace from the start of each line but preserves line breaks.
If you're happy just to adjust the string with a regular expression though, you're probably looking for:
s/^\s+//mg
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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