Yes, her last name relates to Ollie Johnston. Call it a tribute.
Arella is a young teenage Christian girl who's a prodigy in piano but severely blind. She befriends a teenage boy named Sam Crest, who is a troublemaker since he found out his father left him and his mother without a conscience. Their story begins with a piano project to compose an original piece and after this project, Sam wants to learn more about Arella.
It's a story of faith, love, and freedom, and yes, it has a lot of Christian undertones in it.