This thread from 2019 is obsolete. The filters it refers to have been removed as of V20.10.31 :
v20.10.31
HTML5 Removal And Qt Upgrade
Removed QtWebKit and WebVfx (HTML5 components) from all builds.
Added a Text: Rich video filter and made Text: HTML deprecated.
Your workaround is correct, but you can also have a look at this MusicalBox tutorial: