SensorThings API and JSON Good Practice

[sgrellet]

To our understanding, while OGC-API Features has been validated as an INSPIRE Download Service via the OAPIF Good Practice (GP) there is currently no way to validate JSON encoded data (GP on JSON encoding in INSPIRE, no validator).

Which would seem to imply that, to utilize OAPIF within INSPIRE, this API MUST provide GML encoded data is order to claim validity of the payload vis a vis the DataSpecifications

What does this mean pertaining to STA, as this standard only supports JSON encoding? The STA GP includes the mapping from the original GML model to STA encoded JSON, so to our reading, pertaining to STA the JSON encoding should be covered.

What's the official stance on this issue?