Storing complex data for multi-step forms

Hello!
I am currently working on a multi-step form that contains nested data. From what I’ve found on this forum, it seems using Data-Store as a storage for the form data is the way to go. However, according to this reply, it seems there is no support for complex data structures.

Is there a better solution for this other than creating a new Data Store for each object/array in my database and retroactively linking them through an id or something?
Is there a way to edit a singular data entry client-side only and sending the API request at a later time? I have also tried copying data from the API Data Source to Local Storage but I haven’t found a way to edit singular entries in the Local Storage.