Missing information in the documentation about plugin theming: how to show a scrollbar

Features
1

The documentation about plugin theming is concise and well formatted. But it lacks a few points including how to show a scrollbar in the webview

    scrollbar-width: var(--scrollbar-size);
    scrollbar-color: var(--SCROLLBAR-THUMB-COLOR) var(--joplin-background-color);
    display: inline-block; /* or block */
    height: 100vh;

I believe there should be a css variable like var(--joplin-scrollbar-thumb-color) and the variable should be introduced in the documentation.

Thank you!

2

The URL to the document: Plugin theming | Joplin