To do: (1) Fill in those three blanks for the nominees to '2019 WCup'. (2) Crosslink (in both directions) the IZ/KO/WCup pages with the corresponding QP page for faster navigation between them.
That first action was a continuation of a post from last year, C29 Zonal Qualification Paths (December 2019), on this World Chess Championship blog. After researching the 'three blanks', I added the necessary info to the December post. Most of that post was about discrepancies between the list of players who qualified for the 2019 World Cup and the players who eventually appeared for the event. At the time I identified a further project:-
Try to apply [the methodology] to the players listed on Zonal Qualifiers 2016-2017 (C28). Ditto for previous cycles.
As for that second action stemming from the '2020 Candidates', to crosslink pages, I'll tackle it another time.