App Solution Insights

I'm building a journal app intended to be AI-powered in the long run, similar to the AI from the Her movie. It can be either your girlfriend, soul friend, or advisor. It must be an autodiscovery tool and life companion. I'm making some progress; I can store text notes about each day, but I'm at a point where I need to decide what type of metadata I'm going to add to each journal entry. So far, I've thought of the basic ones: location, weather (only temperature), and date/time. However, most journal applications add a field to select how you feel using a word or a numerical degree. I want to build the best journal app ever, so I was wondering if labeling how you feel with a simple word is the best way to describe your feelings accurately. Human emotions are rich and complex, and I want to innovate. If I store emotions using a word like "happy" or "sad," I won't be adding anything new. What are your thoughts on this idea in general, and do you have any suggestions for viable options that could add something new to the journal app market and make reality an AI like in the movie Her?