One way, albeit not pretty, is to form a closure | lexical closure (if that's the proper terminology) over the value of the global $_ and use the closed-over value:

Win8 Strawberry 5.8.9.5 (32)  Sat 05/08/2021  0:53:55
C:\@Work\Perl\monks
>perl
use strict;
use warnings;
my %dispatch = (
    normal => sub{"$_[0] Normal dispatch"},
    map {
        my $__ = $_;
        $_ => sub{"$_[0] Sub returns $__"}
        }
        qw| Uno Dos tres|
    );

print $dispatch{"normal"}->(0),"\n";  # 0 Normal dispatch (as expected
+)
print $dispatch{"Uno"}   ->(1),"\n";  #  WANT: "1 Sub returns Uno"
print $dispatch{"Dos"}   ->(2),"\n";  #  WANT: "2 Sub returns Dos"
^Z
0 Normal dispatch
1 Sub returns Uno
2 Sub returns Dos
[download]

Update 1: Also see this article on closure.

Update 2: Another way, not involving closures - although closures are not to be scorned!

Win8 Strawberry 5.8.9.5 (32)  Mon 05/10/2021  9:33:38
C:\@Work\Perl\monks
>perl
use strict;
use warnings;

my %dispatch = (
    normal   => sub{ "$_[0] Normal dispatch" },
    map { $_ => eval qq{ sub{ "$_ returns \$_[0]" } } } qw(Uno Dos tre
+s),
    );

print $dispatch{'normal'}->(  0), "\n";
print $dispatch{'Uno'   }->(  1), "\n";
print $dispatch{'Dos'   }->( 22), "\n";
print $dispatch{'tres'  }->(333), "\n";
^Z
0 Normal dispatch
Uno returns 1
Dos returns 22
tres returns 333
[download]

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