Determining/Setting H5P Tab Order for Screen Readers

Hi everyone,

Question/quasi-suggestion follows:  

Is there any way to determine, set or alter the tab order of content types placed in a multi-layer capable app (e.g., Course Presentation), to make sure that learners who use screen readers take in the content on a multi-layered slide in a logical or at least, designer-determined order?  At least one content type that I know of (Image Hotspots) does seem to allow customization of the tab order by the designer.

Yet, if I design a Course Presentation slide with several elements on it (e.g., text, video, quiz, etc.), would a screen reader like JAWS or NVDA start at the bottom-most layer item or the top-most layer item?  Since layered items can only be sent to the front or to the back of the layer stack, and we do not have a way of determining the overall tab order of all the elements, how can we know the order in which a screen reader will go through the elemtns when the screen reader's user tabs through the content?

The quasi-suggestion, if it does not already exist, is to add the capability to set custom tab orders to the basic content editors for multi-layer capable content types such as Course Presentation (for each slide); OR, add a field to the individual editors of the elements that can be layered on a slide such text, quiz, multimedia types,  so that a designer has finer control over their tab order in the overall design;  the point being to improve screen reader usability.

I hope my questions make sense and do realize that as a suggestion, it might be a big "ask", but screen reader software should be able to read the elements of H5P content types in logical order to improve their usability.

Thanks in advance,