I found an ad in the May 1948 Ebony from Sports Novelty Co., for a hat, 8 x 10 and "life story" of Jackie. Not definitively the same thing, there's no cover image in the ad, but probably so.
That image of Jackie holding a 1947 Dodgers schedule (I think) appears in Promises to Keep, visible in
this ebay listing. But the original version (in the book) has him in his Royals uniform. A little alteration has happened.
Link to a scan of the magazine; it's on page 58.
https://archive.org/details/sim_ebon...p?view=theater