First of all, this is an incredible journal app! The only thing I think is missing is this feature, so I also vote for this to happen. I know we have the sqlite database, but I found myself trying to convert that into json manually and at some point I feel that it does not make sense that I have to do all the process each time I want a json file, I mean, I had to installed other software to read the database, and even after exporting it to json, the text have some HTML characters so now I need another process to clean that, and I don't even have the tags related to each entry in that json.
Manipulating a sql database is not as easy as a json file which is a standard. As esanpons said, is readable, easy to modify, easy to import/export, like you can do a lot of stuff with that.
Is this something that could happen anytime in the future?