Processing large documents using Word Javascript API / Office.js

Question

For large Word documents its impossible to get all the text at once. For 100+ pager, doing so crashes the extension.

Is there a recommended or canonical approach to break down the document? One reasonable approach seems to be to process a document paragraph by paragraph:

Word.run(async context => {
    let paragraph = ????
    paragraph.load(['text'])
    await context.sync();
});

Where paragraph is the nth paragraph of the document. Is there a way to access the nth paragraph of the document or load just the nth paragraph of a document?