The reference was to observation fields on iNat https://www.inaturalist.org/observation_fields
Some of these fields (those that accept a taxon as a value) have been mapped into standard types of interactions between organisms and are used by other databases (e.g. https://www.globalbioticinteractions.org/)
I assume that by “attributes” you are referring to annotations. Annotations are intended to record basic, standardized attributes that apply to a large variety of taxa and refer to the characteristics of the subject of the observation (which iNat defines as a specific individual at a particular point in time).
So number of specimens or types of interaction would be outside the scope of annotations.
You can read more about annotations and the criteria for suggested additions here:
https://forum.inaturalist.org/t/lets-talk-annotations/627