Add opportunity to use templates with JSON Schema

[sgurin]

Hi, guys. Thanks a lot for such modern forms plugin :1st_place_medal:

Can please help to find solution in next case:

We would like to use JSON Schema with layout not inside the JSON file.

So we wanna use template and JSON at the same time to separate styling with logic because we have a lot of divs for grids and other blocks

Could we get template and put elements that are generated from JSON Schema into it?