[Feature Request] NBT matching for stackable item command

I was initially using this mod for totems of undying so I could make my sorting system a bit easier, but on my server we have some custom items that would be helpful if they stacked, I thought this mod could do it as it accepts nbt in the command, but it made all snowballs stackable to 64.
example command I used:
`allstackable set minecraft:snowball{smoke_bomb:1b} 64`

Would this be possible to implement?

Start with the example `allstackable set minecraft:snowball{smoke_bomb:1b} 64` and trace how item identifiers and NBT are parsed and matched. Done means an NBT-qualified command changes stackability only for items with matching NBT, while other snowballs remain unaffected; add or update coverage for this behavior.

Written by the indexing model from the issue text.