@Alois
Add BingMaps data source to your app.
In the your SharePoint list form, select data card for Distance control.
In the default & Update property, place the following formula:
BingMaps.GetRoute(tbVendorAddress.Text, tbDestination.Text).travelDistance
If you want the Units of distance as well, then you can postfix the above value with distanceUnit
Give a try and share your results.
Regards
Krishna Rachakonda
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