Document Assembly Web App Improvements - MEAN Stack

We are working on a document assembly web app developed on the MEAN stack that allows admin of the site to create templates (using text field and Boolean questions). Here’s a very brief overall description of functionality that currently work – as example, the admin’s authoring of a template looks something like: Hello, {{[login to view URL]}}! {{{{[login to view URL]}}If Boolean is true, this text would appear.}} {{{{![login to view URL]}}If Boolean is false, this text would appear because of the preceding “!”.}} Nesting of these within each other works as well. After the template has been created by admin, the users can use the templates to create documents by filling in the text field blanks and answering Boolean true/false questions. The user input fields are auto-populated by the app, depending on whether it needs to be asked or not. The initial phase of the app is complete, and above are all functional (including respectable UI/UX), but we need a few more features – and this is where we need your expertise. 1. We need the admin to be able to use “AND” and “OR” concepts in the provision logic, as follows: {{{{Boolean.first.variable&&[login to view URL]}}If both Booleans are true, then this text would appear.}}{{{{[login to view URL]||[login to view URL]}}If one of the Booleans is true, then this text would appear.}} It would need to accommodate negation (“!”) as well. 2. Another feature we require is an ability for admin to include a drop-down menu and check-the-box menu (instead of just true/false radio buttons) for users to choose from. These would accommodate more than 2 choices, and structured as being able to set multiple Boolean values. In a drop-down menu, if item 1 is selected, it is set to true and items 2 and 3 are set to false. In a check-the-box menu, whichever is checked becomes true and unchecked becomes false. 3. In addition, we would need to create a new variable type “date” with ability to automatically update another field (i.e. date + 30). The date needs to be selectable from mini-calendar style or simple type-in by the user, and displayed as MM/DD/YY or long ordinal style (January 1, 2020) upon user’s choice. It needs to be able to accommodate (i.e. not result in an error) a blank or uncertainty (January [ ], 2020). 4. The app currently is able to output the assembled documents in PDF, but we will need a feature to output into JSON. The reason for JSON is that it will ultimately be used to create a high fidelity Word DOC (not just HTML conversion into Word), but that is a separate work stream using different architecture and libraries (not MEAN stack). The MEAN stack portion just needs to worry about generating the JSON file (a sample expected output is available). We use Basecamp as project management tool and Github as version control. AWS is where the site is currently hosted. Please let me know if you are interested. If job performance is satisfactory, more work will be available. Thank you.