They might be part of the same social circle within the entertainment industry. Since both are popular among the younger generation, they could have crossed paths at parties or premieres. Finn Wolfhard is known for his roles in shows like 'Stranger Things' and Gracie Abrams for her music. There could be a story where Finn showed interest in Gracie's music and they started a conversation that led to a friendship, but this is all speculation at the moment.
As of now, there isn't a lot of publicly known detailed story about them specifically. It's possible they just know each other casually in the entertainment world.
There may be a story in the making. With Gracie's rising music career and Finn's continued acting success, they could be on the verge of a more significant collaboration. For instance, Gracie might be creating a song for a movie or show that Finn is in. Or they could be working on a charity event together. However, without more information, it's hard to say exactly what their story is. But the potential for an interesting connection between them is there given their respective popularity and influence in their fields.