How does one ensure that specific classes remain available even though they are not present at build time?

[mihaiconstantin]

Suppose you have an app that allows users to inject content at runtime (e.g., HTML). Now assume you also want to give them the option to stylize that content using Tailwind. How can you ensure that those classes (i.e., or at least a reasonable subset) are included in the CSS build? I am using v4.0, and the only solution I've found is to ditch Tailwind as a dependency and use a CDN. Surely, there must be a better way?