Hi everybody, I didn't test it deeply yet, but Grafana, a well known opensource web dashboard tool, can now connect to OData datasources 
Maybe it could be interesting for some people here.
To test it, you can use the docker image, and once connected on, install the OData plugin :
docker run -d -p 3000:3000 --name=grafana --network="host" -e "GF_PLUGINS_PREINSTALL=dvelop-odata-datasource" grafana/grafana
For now I've just tried to log in and show submissions information, but I need to go further and explore repeats querying and mapping geometries.