How to extend a view of child app which is a custom UI5 application and not an extension project (which has extension points declared through core) through a parent app which embeds the chid app?

I have 2 apps, parent app and child app. My child app is like a product which is embedded within the parent app. I have provided the extension point in the child app, and would like to extend it through the parent app.

I have written the following code in my child app :

childappview.png

And in the parent app, i have declared the Component Container part , wherein I want my child app to load.(which is getting embedded perfectly).

testview-of-parent-app.png

and I have registered it too in the component.js of my parent app.

oninit-of-component.png

In the Component.js, I have declared the code for customizing, in order to access my extension of my child app :

componentparentapp.png

Despite writing the code in component, I am not able to see the extended code which I have written in my fragment in the output. Please help me on this.