Bla.pm6

use Exportable;

sub bla is exportable { 42 }
sub ble is exportable { 42 }
sub bli is exportable { 42 }
sub blo is exportable { 42 }
sub blu is exportable { 42 }

Exportable.pm6

sub EXPORT {
    say "EXPORT";
    my Routine %funcs;
    multi trait_mod:<is>(Routine \r, Bool :$exportable! where * === True) is export {
        say "exportable => $exportable";
        trait_mod:<is>(r, :exportable(r.name))
    }

    multi trait_mod:<is>(Routine \r, Str :$exportable!) is export {
        dd %funcs;
        say "exportable => $exportable";
        %funcs{ $exportable } = r
    }

    multi exported-EXPORT() {
        {}
    }

    multi exported-EXPORT(Whatever --> Hash()) {
        %funcs
    }

    multi exported-EXPORT(*@funcs --> Hash()) {
        say "exported-EXPORT: @funcs[]; %funcs<>";
        %funcs{ @funcs }:p
    }
    say "returning";
    {
        '&EXPORT' => &exported-EXPORT
    }
}

index.p6

use lib ".";
use Bla <bla>;

#say bla;

OUTPUT

Hash[Routine] %funcs = (my Routine %)
Hash[Routine] %funcs = (my Routine % = :bla(sub bla { #`(Sub|140511307538080) ... }))
Hash[Routine] %funcs = (my Routine % = :bla(sub bla { #`(Sub|140511307538080) ... }), :ble(sub ble { #`(Sub|140511307538232) ... }))
Hash[Routine] %funcs = (my Routine % = :bla(sub bla { #`(Sub|140511307538080) ... }), :ble(sub ble { #`(Sub|140511307538232) ... }), :bli(sub bli { #`(Sub|140511307538384) ... }))
Hash[Routine] %funcs = (my Routine % = :bla(sub bla { #`(Sub|140511307538080) ... }), :ble(sub ble { #`(Sub|140511307538232) ... }), :bli(sub bli { #`(Sub|140511307538384) ... }), :blo(sub blo { #`(Sub|140511307538536) ... }))
EXPORT
returning
exportable => True
exportable => bla
exportable => ble
exportable => bli
exportable => blo
exportable => blu
exported-EXPORT: bla;