Custom App does not appear in Assets even after build

Not sure why my custom app does not appear in this asset folder.
I placed a build.json inside the “myapp/myapp/public” folder of my custom app. Also I build all using bench build. But seems like nothing is being generated from myapp
. Here is the build.json of myapp
{“js/myapp.min.js” : [“public/js/doctype/doctype_custom_scripts.js”]}

I’m currently using Frappe version 14.

My goal is to create a javascript that will run every load of the custom app.