OpenWrt support for Keenetic Hero 4G

How to / is it possible to install OpenWRT onto Keenetic Hero 4G

Model page: https://keenetic.com/en/keenetic-hero-4g

In principle it should be possible: Main CPU is MT7621, but the manufacturer page gives no indication on the WiFi chipsets.

How: https://openwrt.org/docs/guide-developer/add.new.device