Option 1: block editor
The block editor supports a document structure that is largely similar to a Word document, so therefore is quite useful for importing Word content into the RC. The difference with it and PDF is that it supports embedding media inline with the text and will be much easier to read on smaller screens. You can also edit your text using the standard RC tools.
First, create an empty exposition or a new page, be sure to select "block editor" as the format.
You can import the word document content, using the Media tab.
You click and then upload the word document under the "documents tab".
Once the upload finishes, the document will be converted into a folder of RC "tools" in your media tab. You can then drag these tools into your exposition content. The big advantage in using the imported tools for text is that footnotes will be automatically converted into the RC footnotes/popovers.
If you find that the formatting differs too much from your document, you can also copy-paste the text parts of your exposition directly from Word into HTML or text tools. It is best to not do the whole document at once, but do it in smaller batches, this makes it easier to insert other elements later. A good rule of thumb is about a page of text or less at once.