can i install this os in to Xiaomi Mi Max 2 ?
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
Device codename is oxygen.
Latest unofficial LOS I found is 14.1 (Nougat) … [ROM][UNOFFICIAL][7.1.2][oxygen] LineageOS 14.1 with Enforcing SELinux | XDA Forums
Without a Pie a Q LOS source tree, it is unlikely to have this device supported unless someone with strong dev skills is willing to.