Override admin popup default url

Hi,

I need to pass some extra parameters in some admin popups. For
example, this is the default URL for an arbitrary popup:
http://localhost:8081/admin/web/systemgroup/add/?_popup=1

What I want is add a new element on the dict queryset:
http://localhost:8081/admin/web/systemgroup/add/?_popup=1&contact_id=1

Where is the right place to handle that?

Thanks!!!
--
Marc

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