I was more worried about getting my gigabit lan working, which it did. Regarding wifi, I was surprised myself to find it working. Didn't really expect that nor do I need it actually. I tried the 5ghz wifi speed and it was really slow tbh.
I didn't really do anything extra. Just copied my dtb file in and edited the uEnv.txt file. That's all. Here's my nmcli output if it's of any help. (wifi disabled from GUI)
root@arm-64:~# nmcli
eth0: connected to Wired connection 1
"eth0"
ethernet (meson8b-dwmac), ......
wlan0: unavailable
"Broadcom Wi-Fi"
wifi (brcmfmac), .....