Without knowing the story of Far From Home, and Ant-Man’s current Quantum Realm predicament, it’s difficult to say exactly how they would cross paths; still, I’m sure Marvel could make it work.
Peter still goes to school and has girl problems while Scott just wants to be a great dad to his daughter.
Tom Holland has even advocated having Spider-Man team up with Ant-Man next and he already has some ideas about what that could look like.
Peter Parker and Scott Lang (along with Hawkeye) are unique in the MCU in that they maintain the most normal lives among their heroic brethren.