This module should be of help for importing the data into the app.https://appstore.home.mendix.com/link/app/429/
Exporting can be done using the build-in feature: https://docs.mendix.com/refguide/control-bar#export-to-csv-button
Or using one of the modules in the appstore like: https://appstore.home.mendix.com/link/app/726/