Send whatsapp message from kobo-collect

I am working on a project with some farmers.
However, researchers want to be notified when a farmer enters data.
Farmers don’t use email on their smartphone, but whatsapp.
I could try with rest-service, but I would like the data to be sent by whatsapp to the researchers before the final entry, and therefore before the farmer finally uploads the data to the server.
So the best way is ex: com.whatsapp (extras)
I found this
ex:com.whatsapp(android.intent.extra.TEXT=‘some text to send’)
in past posts
Whatsapp is opened, but nothing else happens.
Maybe you need to do ex:
You see I’m not a computer scientist, huh?
In fact, I’m a researcher in agriculture, I’m doing it for others!
Thank you in advance