Please read this thread first, that question has been answered numerous times. The prebuilt images only contain a very basic configuration + webinterface/ luci, anything beyond that is not prebuilt - while you can add many userspace applications 'by chance' (as there are other ARMv8 targets building those for OpenWrt), you're out of luck as soon as you need any kernel modules (by definition, as the dependencies between the running kernel and its modules are even stricter than 'just' the target, which doesn't even exist in OpenWrt yet).

tl;dr: if you need any kernel modules, you will have to build the firmware from source yourself, based on robimarko's trees and enabling/ statically including your desired additions.