By "totally geeking out [and] taking pictures," he tells TVGuide.com.
On Wednesday's Hot in Cleveland, which stars Valerie Bertinelli , Jane Leeves and Wendie Malick, the 20-year-old guest-stars as the son of Melanie (Bertinelli). He's stopping by to say hi on his way to college.
Considering the actor is much younger than the show's stars as well as notable guest stars like Carl Reiner (88) and Tim Conway (76), Jonas asserts, "the scenes are really funny ... anyone from any age will get the role and enjoy it."
Jonas adds that his whole family (that includes famous brothers and bandmates Nick and Kevin) is a fan of Bertinelli's and that he learned a lot from the cast, "especially making mistakes and not feeling embarrassed about it."
Jonas especially enjoyed working with the 88-year-old White.
"It was such an honor, so I took as many pictures as I could. [Our] scenes together are pretty funny ... people are going to laugh when they see us together," he says.
Will Jonas return as part of the Cleveland family next season? "It would be awesome to come back," he says. "I told the writers I'm down."
Hot in Cleveland airs Wednesday at 10/9c on TV Land.