JSON Schema defines keywords title and description, see
http://json-schema.org/latest/json-schema-validation.html#anchor98.
A "title" is short and seems to correspond to field labels or column headers, whereas "description" seems to correspond to an explanation shown as a tooltip. The latter seems in sync with use for Core.Description.

Currently the Core annotation Description is represented as an instance annotation:

"@Core.Description": "Some explanatory text explaining this model element and its use and/or restrictions"

Instead it could become a JSON Schema description:

"description": "Some explanatory text explaining this model element and its use and/or restrictions"

Pro:

• Recognizable by JSON Schema consumers

Con:

• Different representation as @Core.LongDescription which doesn't have a counterpart in JSON Schema