Emotional Impact Rating for movies (or any video in general)

Would it be useful to build a model which can rate a movie [-5, 5] based on how it affects a person’s mental health. (For e.g. -5 for depressing/violence evoking movies and +5 for elevating / happiness evoking)
Along with the rating, we could also emit a line chart showing how the mood changes along the timeline of the movie.
Given the recent focus on mental health, anyone interested in collaborating and building this? However, we need to first do a market research on whether people really need this.