Maybe something like this (if I'm understanding you correctly):

package Bar;

use Exporter 'import';

our @EXPORT_OK = qw(x);

sub x {
    print "x(): @_\n";
}
1;
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package Foo;

sub import {
    print "Foo::import(): @_\n";  # debug
    require Bar;
    
    # do whatever you want with the import() args, e.g.
    shift @_;
    Bar->import(@_);
}
1;
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#!/usr/bin/perl

use Foo 'x';   # x() will be imported from Bar into Foo namespace
               # (as would be done when using a hardcoded "use Bar 'x'
+" within Foo)

Foo::x('bla');

__END__
$ ./824136.pl
Foo::import(): Foo x
x(): bla
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