Definitely. The story of Hachi originated from a true event. It showcases the remarkable devotion and unwavering love a dog can have for its human companion.
Boruto could be developed by showing his growth in responsibility. For example, in the fanfic, he could take on the task of teaching Himawari a new jutsu. This would not only show his skills but also his patience. Himawari, on the other hand, could be developed by showing her becoming more independent. Maybe she decides to go on a small mission on her own to prove herself to Boruto.
I'm not sure specifically what the 'hachi original story' is without more context. It could be about a character named Hachi. Maybe it's a story about Hachi's adventure, or his relationship with other characters in a particular fictional world.