multi-level sort using a list

[Banakayou]

Hello,
I'm trying to use multi-level sorting for my music album collection

collections:
  BOSSA NOVA:
    builder_level: album
    smart_filter:
      sort_by:
        - album_artist.asc
        - release.asc
      all:
        album_label: BOSSA NOVA

I already tried also with "originally_available" but it always use album title as secondary sorting.

Here is the output for the collection :

|                                            Collections                                             |
|====================================================================================================|
|                                                                                                    |
|====================================================================================================|
|                                   BOSSA NOVA Collection in Music                                   |
|====================================================================================================|
|                                                                                                    |
|================================= Validating BOSSA NOVA Attributes =================================|
|                                                                                                    |
| Validating Method: builder_level                                                                   |
| Value: album                                                                                       |
|                                                                                                    |
| Validating Method: smart_filter                                                                    |
| Value: ordereddict([('sort_by', ['album_artist.asc', 'originally_available.asc']), ('all', ordereddict([('album_label', 'BOSSA NOVA')]))]) |
| Smart URL: ?type=9&sort=artist.titleSort%2Calbum.titleSort%2Calbum.index%2Calbum.id%2Calbum.originallyAvailableAt%2CoriginallyAvailableAt&album.label=139954 |
|                                                                                                    |
| Validation Successful                                                                              |
|                                                                                                    |
|================================== Running BOSSA NOVA Collection ===================================|
|                                                                                                    |
| Smart Album Filter                                                                                 |
| Sort By: ['album_artist.asc', 'originally_available.asc']                                          |
| Filter:                                                                                            |
|   Match all of the following:                                                                      |
|     Album Label is BOSSA NOVA                                                                      |
|                                                                                                    |
| Items Found: 10                                                                                    |

To achieve my goal know I could also force update the sort_title metadata for the album with their release date, but I wanted to know if any of you guys made multi-level sort working.

Thank you for your help.