Well, a lot of fanfictions about Gaara and Sakura in the Chunin Exams might focus on their potential relationship development. Gaara, being the lonely and troubled character he is, could find solace in Sakura's kindness. It could be a slow - burn type of relationship where they first start as rivals during the exams and then gradually come to understand and respect each other more deeply.
Fanfiction often takes the basic elements of the Chunin Exams and twists them for unique stories involving Gaara and Sakura. One idea could be that they are paired together for a special part of the exam. Gaara's sand abilities and Sakura's medical skills could create an interesting dynamic. They might have to rely on each other to overcome obstacles, which in turn could lead to a deeper bond between them. This could also lead to changes in how they are perceived by their respective villages.