That's also outside my experience. I took some pictures from just behind the end zone in a VIP area last fall, but I was doing it to get used to my new G5X II before I left on a trip. The maximum 120mm equivalent and the large DOF of the little lens won't produce those challenges. But it did produce some really nice pictures, including a touchdown from a few feet away and a field goal video in which I panned up to follow the ball as it went between the posts and then over my head.
Most summers I shoot videos of some after-hours pickup games during basketball camp. They usually include current players, entering freshmen, pros in from Europe and sometimes a few Charlotte Hornets and some prospects. Steph Curry used to come back early in his pro career, and one time he brought his little brother when he was playing for Duke, but now is too busy with everything, including his own camps. I have a small, but very eager audience for the videos. I use it to try out whatever camera I have that is new, largely as a way to learn how to use it. I have found that for my purposes, just focusing manually on one of the rims and relying on hyperfocal distance to keep everything tolerably sharp. I'm not wanting to isolate one player usually, but want to show the whole play. I do my zooming with FCP X.
I do have a couple of friends who are sports photographers, one a pro who has many of the area colleges as clients. The other is a neighbor who shoots games at the college for the local news web site. (She's also on the town council and is a retired Navy captain. Amazing woman.) They both have really sharp pictures, none with different body parts in and out of focus. I should appreciate their work even more after your comment. They both shoot Nikons, BTW.
Thanks for helping me to relate a bit to situations outside my experience.