Yes, it is possible to calculate the locations based on a dropdown. Geopoints receive a string that consists of <latitude>_<longitude>_<altitude>_<accuracy>, with the altitude and accuracy components optional. See Geopoints—Survey123 for ArcGIS | ArcGIS for more information, as well as the following samples available in Survey123 Connect:
From survey connect it works perfectly but when I publish and use it on my pc to enter data it doesn't work... Only work on the app.
I find this option very useful, is there any solution if you enter data from your pc?