Data model for blog application with Firebase / Firestore

We have a requirement to create an blog application where user's can write blogs like in medium.com or wordpress in general.

User can add text and images as and when they want.

Thought of using Angular for UI and Firebase/Firestore as database service.

Blogs can be a collection of its own where each blog will be a document under blogs.

Was wondering how to store the entire blog content which is mix of text and images in any random fashion.