Is it not possible to integrate what3words into mapping?

It appears we only have co-ordinates as an option to use mapping?

From the user Guide at Location Questions | Epicollect5 Data Collection User Guide

Epicollect5 does not feature any way to automatically pick up an address based on latitude and longitude. Such a feature would require a reverse geocoding service (usually not free) and an internet connection thus it would not work offline.

For projects requiring it, latitude and longitude values can be converted to addresses in the post-processing of the data by using a third-party service like What3Words or Geocodio.

However, when using the web application, Epicollect5 provides address lookups, see →