Thor: Love and Thunder is based on Jason Aaron's Mighty Thor, and some people might like to read the comics a movie is inspired by before watching it, so I read through every single comic Jane Foster has been in since Thor: God of Thunder (2012) to create this reading list. Those are my personal recommendations and this is by no means an ultimate guide! Under the cut is the written list + some extra comments.
This list is accurate as of September 14 2021.
Essential reading is bolded, I considered essential the books where Jane's the main character, important character moments, and events that directly affected the main books. I did my best to order these chronologically!
Thor: God of Thunder (2012) #12, #24: Jason Aaron's first Thor book!
Unbelievable Gwenpool #2: The art style on this one is just delightful.
All-New, All-Different Avengers #1-12: I'm not too fond of this book to be honest, I don't like how she's portrayed here, but it certainly happened.
Vote Loki
Mighty Thor (2016) #8-702: Unfortunately there are not actually 700+ issues of this comic, they just changed how they numbered them at some point.
Civil War II #1-3: Honestly just skip all the Civil War II stuff, especially if you're coming from the movies, I only included it in the list cause it affects ANAD Avengers.
All-New, All-Different Avengers #15: Jane is the focus of this issue, it's my favorite from ANAD Avengers.
Civil War II #4-6
Avengers (2016) #1-8
The Unworthy Thor #4: This book, also by Jason Aaron, happens at the same time as Mighty Thor and while it affects that story, Jane is only in this issue and only in a couple pages.
Doctor Strange (2015) #17, #18
Secret Empire #0
Avengers (2016) #9: This is another Jane-focused issue and it's fantastic, I think it's a really key character moment.
Secret Empire #9, #10
Generations: The Unworthy Thor & The Mighty Thor
Avengers (2016) #11, #672-674
Champions (2016) #13-15
Doctor Strange (2015) #381
Avengers (2016) #675-690
Mighty Thor (2016) #703-706
Mighty Thor: At the Gates of Valhalla
Thor (2018) #1, #8, #9, #11: Odinson takes back the mantle of Thor and Jane becomes a secondary character, however there are still some cool character moments.