You can use the BTTV settings but I haven’t been able to use BTTV emotes (if you manually type the emotes out they will work, and you can see the BTTV emotes in chat, but there is no emote list on Brave yet). Simply Install BTTV to Brave and enable it in extensions, open Twitch, click the settings wheel under chat, at the bottom you will see BTTV settings. You can mess with all the setting you’d like but you can not use the emote list sadly. Everything I’ve tested works so far no issues.
Hope that helps!