Seperate devices from same mqtt

I have many shellies on my mqtt, i get all announce to shellies/announce All look like this:

`{"id":"shellyswitch25-688755",
"mac":"2CF432688755",
"ip":"192.168.1.29",
"new_fw":false,
 "fw_ver":"20191216-090135/v1.5.7@c30657ba"}`

How can I make sensor that show only if device shellyswitch25-688755 have update?