You could have just made it start on timer. i used that mechanic in my game to get around " no button"
Viewing post in Mini Jam 66 - How Sweet comments
Chrome unfortunately requires at least one click to activate audio in games made with Godot:
"Chrome restricts how websites may play audio. It may be necessary for the player to click or tap or press a key to enable audio."
Source: https://docs.godotengine.org/en/stable/getting_started/workflow/export/exporting_for_web.html