Can you please say a little bit more about what you mean here. Are you referring to text fields and their width?
Yes, as shown in CSPro example, width is accordingly as the item number of digit describing its size.
The ability to lay out questions in a grid?
Yes, will be easier to fill matrix question in a grid.
If you need a JSON representation, we recommend requesting that from Central:
What we need is a relational schema of questionnaire data on server. It's something you don't plan to implement.
If you give questionnaire JSON data on the server, it will be very well and this will facilitate ODK users in storing questionnaire data in relational schema.