Importing perl modules " URI::Escape","URI::Encode"

Hi,

I want to call perl modules ,'URI::Escape' and 'URI::Encode' . I tried to call these modules with the following configuration. However, error occurred.
"Configuration"
perl_require URI::Escape; #config 1
perl_require Escape.pm; #config 2

I would like to know the example of using 'use' for Nginx configuration or alternative way.

Below is the configuration what I want to set.

perl_set $uri_unescape 'sub {
my $r = shift;
my $uri = $r->uri;
return uri_unescape($uri);
}';

Thank you in advance.