Inline and Defer CSS

I’m optimising my website as much as I can and I’d like to start using the “Inline and Defer CSS” feature to try and pass the critical path rule. This does work fine, but the problem is that the plugin only allows me to add CSS for one page. This critical path CSS will obviously change depending on the page (e.g. product page, category, home etc). Are there any plans to make this work across multiple pages? Otherwise, other pages just fail the following rule:

Prioritize visible content: Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content. The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response. Only about 26% of the final above-the-fold content could be rendered with the full HTML response.