Other than a few tags in the table below, JSON tags have not been pre-defined. However, ExifTool will read any existing tags from basic JSON-formatted files.
Tag Name Writable Values / Notes ON1_SettingsData - --> PLIST Tags ON1_SettingsMetadataCreated no ON1_SettingsMetadataModified no ON1_SettingsMetadataName no ON1_SettingsMetadataPluginID no ON1_SettingsMetadataTimestamp no ON1_SettingsMetadataUsage no ON1_SettingsMetadataVisibleToUser no