I'm on the March 2024 version of OAC and I still don't see a way to get HTML/CSS/JS to render in my DV workbooks.
In classic/OBIEE you could accomplish this by adding a text box to a dashboard page and checking a box to make it display HTML.
Another way to do it was to build a classic/answers analysis that has a Static Text, which also contains the checkbox to display HTML.
This feature was extremely useful. I had used it to build icons that cause a box to appear when the user hovers their mouse over or clicks on them.
The only way I can kind of do this in DV is if I create my own plugins, which is a lot more time consuming than simply throwing some scripts and styles into a text box and checking a box.