I’ll just stick this ‘speculative’ article here - www.io9.gizmodo.com/what-the-hell-is-the-opening-crawl-for-the-last-jedi-go-1791628778
(However, I’ve no worries that the events of TFA can be ‘summarized’ in a reasonable way, before the scroll catches up to the present with Rey and Luke - in much the same way as the scroll for A NEW HOPE now retrospectively describes the events of ROGUE ONE, as well as the events currently unfolding)