The JSON Schema file that defines the resource can be determined from the @odata.type returned in the payload.
The filename will be portion of the @odata.type after the hash and up to the last period. Example: for @odata.type of "#Chassis.v1_2_0.Chassis", the corresponding JSON schema file will be "Chassis.v1_2_0.json". Within the JSON schema file, the "title" will match the @data.type exactly.
Note that the JSON schema files may be accessible through the Redfish Service implementation - if there is a "JsonSchemas" collection, it can contain links to local or remote copies of the schema files.
They can also be accessed from the official DMTF Redfish Schema Repository at: redfish.dmtf.org/schemas Note that your schema-aware application should cache these files locally to avoid requirements for Internet access (and avoid latency and load on the server!).
Within ServiceRoot, there is a navigation property named "JsonSchemas"; if a service has implemented it, it can advertise the JSON schemas in that link. The members of that collection are all of type JsonSchemaFile, which in turn contains the URLs to the individual JSON files as well as the Schema name (such as Chassis.V1_2_0.Chassis).