This extension will let you change the volume of the youtube player by scrolling on it.

git clone github.com/emilyxfox/youtube-scroll-volume

deno run build

Navigate to (chrome://extensions)[chrome://extensions] or your browsers equivilent.

In the top right click toenable developer mode.

Click the load unpacked button and select the dist directory.

You can now change the volume of any normal (non-short) youtube video by scrolling on the player.

You can change the volume step size for each scroll by clicking on the extension icon.

Your step value is stored in Chrome Synced Storage.