Ember-Example | Example app for Ember.js | Addon library

tl;dr I want to understand how to be able to add sections to the DOM from a list of unknown length with the ability to reference the value of each element in a section later on.

I'm developing an application for a school submission and am having some trouble with the GUI. It uses an MVC Framework with the Model being SQL, the View being HTML, CSS, and JS, and the Controller being Python (with JS as a translator).

My problem is that I'm sending a list of data to the frontend from python that contains a bunch of information relating to a certain client. This information includes the client themselves and their family members. I need to be able to build the front end with each of those family members (of an unknown number) with the ability to reference each block of data if they're edited by the user (and thus sent back to Python so it can be committed into the database).

I have no clue how to approach this and I haven't been able to find anything (I don't know what to search for) on how to add sections of elements to HTML with the ability to reference each element later on.

Here's an image of what I want to do (I don't have enough points to put it directly into the post)

And here's an outline of what I want to be able to do in code (I'm not great at webtech and came up with a basic example)