I have written a user script that audio plays audio files on AnkiWeb, because the Anki app is broken on my Chromebook. Maybe somebody else finds it helpful.
It works with multiple audio files on the front and back site. The only difference to the native app is that it doesn’t work on the first card, because browsers block audio playback when the user hasn’t interacted with the page yet.
It can be installed using this URL: https://raw.githubusercontent.com/fvclaus/ankiweb-autoplay-audio/main/ankiweb_autoplay_audio.user.js
More details can be found here: https://github.com/fvclaus/ankiweb-autoplay-audio/tree/main