Should Input be limited to the "official" BIDS entities?

[Remi-Gau]

https://bids-standard.github.io/stats-models/_autosummary/bsmschema.models.BIDSStatsModel.html#bsmschema.models.BIDSStatsModel.Input

There is no limitation or recommendation at the moment either whether one can use something else than the raw + derivatives entities, or if the "short form" of the entities ( for example acq instead of acquisition) are supported.