It might also be worth considering a configuration file. This depends on your variable definitions, of course, but if they don't require to be perl code, an INI/JSON/YAML file could be the better solution.

If this is not possible, I would probably use a module and let it export a $config hashref. This has the advantage that it's clear in the main code where the variable is coming from.

use MyConfig qw/ $config /;
say $config->{somekey};
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Letting code "import" a number of variables implicitly is usually a bad idea in my experience.