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How to display time to walk to a location

Hi there! I have a repeating group and each element inside it has a postcode attached to it - What I’m trying to display is how long it would take for the user to walk to the location of the element. So I obviously need to know the user’s location, but once I have this how can I ask bubble to extract from Google Map the time it would take to walk there and display it as dynamic text?

Thank you in advance for your help!