According to STIX 2.1, Observables are captured artifact objects such as an IP address, a network connection, a file, or a registry key.
Here are the Observable items that you can add on scoutTHREAT:
Autonomous System (ASN)
An Observable may be used by itself (without relationships) to convey raw data collected from any source including analyst reports, sandboxes, and network and host-based detection tools.
An intelligence producer conveying this artifacts should include as much context as possible to utilize this data for improved security.
Observables can capture that a piece of information was seen one or more times. Meaning, it can capture both a single observation of a single entity (file, network connection) as well as the aggregation of multiple observations of an entity.
For more information on Observable Data, review STIX 2.1 documentation online.