Sorry for the delay!

Actually, I just added a simple Vue.js frontend that communicates via axios to the backend, including Vuex, Vue-router, Vuetify...

And I recently created a brother project that generates all the stack but based on CouchDB, it's more similar to MongoDB (and uses a query system very similar to/inspired by Mongo queries). It lives here: https://github.com/tiangolo/full-stack-flask-couchdb

I think it can help you define how to structure the architecture and code.