search for carparks within an area

I have found that there are some carparks that have a road stopping one side of it and a path starting on the other side of the carpark.

Unfortunately Garmin will not route through the carpark so will send me the long way around.

What I want to do is search around my area and find the carparks so I can put in a parking isle or path to join the road and path so routing will work as expected.