This is not possible with Visforms itself. But there is a content plugin for Visforms that allows you to display forms in articles and modules (of type "Custom HTML) and to set custom default values in the form. One plugin option is, to set the page url of the current page automatically as default value in form. Learn more about the Visforms Content Plugin Form View.
Joomla 5 Notice
We are pleased to announce that as of January 29, 2024, all of our Joomla extensions are compatible with Joomla 5.
For all who are still updateing from Joomla 3 to Joomla 4: Joomla 4 Migration instructions are available here:
There is now a separate Documentation for Visforms for Joomla 4 and for Visforms for Joomla 5!