You can get the FFUpdater app from F-Droid, then use that to install Brave to your phone. But at that point, you may as well just use FFUpdater to install the much better alternative, Firefox, which doesn’t indirectly support Chromium engine dominance and doesn’t have that weird crypto crap Brave has.
Edit: Someone else replied to you suggesting Mull, which is also downloadable through the FFUpdater app.