There's no official way to do that, but if you can live with an undocumented approach, you can inspect $Role::Tiny::INFO{YourRole}{requires} e.g.

package BasicRole;

use Moo::Role;

requires qw(abra cadabra);

1;

package App;
use Moo;
with 'BasicRole';

sub abra { 'abra' }

sub cadabra { 'cadabra' }

1;

package main;
use strict;
use Data::Dump 'dd';

my $app = App->new();
dd $Role::Tiny::INFO{BasicRole}{requires};

__END__

Output:
["abra", "cadabra"]
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