Jane Foster IS Thor...I mean Thordis...in WHAT IF? "...Jane Foster Had Found the Hammer of Thor?" Part 1

Before Jane Foster became Mighty Thor in Thor: Love and Thunder...
...she had wielded Thor's hammer, Mjolnir in the comics, the first time in what is considered an "imaginary story" (ie: a tale not in official continuity).
But let The Watcher explain...

Verily, the saga continues...
TOMORROW!
Note: In the Silver and Bronze Ages, DC had no problem using the multiverse/parallel world concept regularly, beginning with "Flash of Two Worlds" Flash #123, creating multiple Earths where variations (including the Golden Age versions of characters) lived!

Marvel, OTOH, shied away from the concept like poison, believing everything from the Golden Age Timely days to the 1950s Atlas era to the 1960s Silver and 1970s Bronze Ages could fit in a single universe, with any variations...

...like this being mere temporary glitches in the fabric of the Marvel Universe!
Of course, all that's changed since😱...