[Question] notification source URL variable

[MaxPegankin]

Hello,
I am straggling with notifications source links. I need to work it like this:
-Press this button from the page:

-Create a new notification with type "From user".

-Make a workflow to handle this event and send this notification's content to the assigned user by email.

But in the workflow creation, I can't find a variable for the URL of the page, where this notification button was clicked. So the recipient can't understand what is this Notification email about.

Does anybody have ideas how to make it?

Thank you.