Dart - / JavaScript Coding on App & Backend to make some changes

Description

We have an app and backend which is needs some updates and changes:
The app is used on a tablet and has a backend admin website:
Changes required are - have attached photos of changes also:
Add two checklists (Hot hold and Chill and Weekly Checks) - can be the same as current checklists just need two additional. And Need to add a new form for Deliverys. These all need to feed into a daily report system on the app/backend also (setting page to control).
Also need a button added to our Allergy check page in Tablet which will display a pdf or jpeg or allergy chart which is uploaded on the Admin Website.