Shelly 3em pro mqtt in grafana

i want to add a shelly 3em pro to my grafana dashboard. I need it for my Solar dashboard.It should show me the values of my 3 Pahses .The 3em pro is connected via mqtt. i get the values over iobroker. But i cant find any values that i can use. Does anyboby addes the 3em pro to grafana?
Is theres a channce to add the 3em pro?