There is a audio-script repository for Chromebooks, which works for Ubuntu 23.10 and later versions.
wget https://github.com/WeirdTreeThing/chromebook-linux-audio/archive/ee4f0da7a9a60dfa1435722f9f65cc6334eb1735.zip
unzip ee4f0da7a9a60dfa1435722f9f65cc6334eb1735.zip -d chromebook-linux-audio
cd chromebook-linux-audio/chromebook-linux-audio-ee4f0da7a9a60dfa1435722f9f65cc6334eb1735/
./setup-audio
And reboot.
Your chromebook is supported.
Note that Ubuntu 22.04 is not well-supported by the audio script. Please use 23.10 or later versions instead.
Note that the latest version of Audio script does not support Ubuntu, and the developer recommends using another distro due to issues in Ubuntu, and also because the audio script requires a recent version of kernel.
However, I tried removing the condition to check for Ubuntu in the latest version of the audio script, and it worked perfectly in Ubuntu 24.04.