Why create admin links for a custom app is not available

Hi everyone

We are wanting to create a custom action that can be displayed on the product page under More actions, like this:

I believe the term for this is an “admin link”. Our app is a custom app that has been created via the Shopify Admin interface under AppsDevelop apps.

Within the partner dashboard, Always I can create under Extensions, but there is case nothing within the app settings in the Shopify Admin called Admin Link .

Is there any way to achieve this functionality or any reason that is no possible to create that ?