Is it possible now to have a custom subgrid for each master row?

The subGridModel is defined one for all subgrids of each row. I need have for each row custom subgrid with different number of columns. The following use case shows what I mean:

1. Page was loaded.

2. User see a table with possibility to expand each row.

3. User expands some row and grid makes a request to the server to obtain a subgrid model (column names) and subgrid data.

4. Master grid expanded with a subgrid having returned count of columns with data.