You can use a parameter or a field value as part of a URL in a URL action, but you would have to interact with a mark on a view to trigger the URL Action.
I imagined a system where the user will be presented/choose the value of the points. Like you said these can come from a parameter or a field value. These points will be mapped to Google maps by the URL action. Then the view will display without the need of any manipulation (from the user perspective on the Google maps display). If this is possible I will appreciate it very much if you can provide any example of how to successfully incorporate a driving direction display within a dashboard.