I tried it this morning (lineageOS). Got the arm binary from github, `chmod +x`-ed it on my computer and scp:ed it over to my phone. Ran the binary and got a quick flash of the screen and a `exit status 1`.
Have not looked into it more than that. Since `browsh` depends on headless firefox, which is not in the termux default repository (it seems), I guess it won't work because termux does not have access to the firefox system app, if that even shits with the headless-functionality. (but here I'm just guessing, a work around may be available)
I haven't really made it clear enough in the docs yet, but Browsh is meant to be run on a remote server and then accessed over SSH/Mosh or the HTML service. So there's not much advantage to overcoming the hurdles to getting running on Android. You should just SSH or better yet Mosh to access a remote version of Browsh.