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isUnlabelledFallback

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > isUnlabelledFallback

This can be marked 'true' to indicate that some published ShippingRateSettings are intended to apply to all OfferShippingDetails published by the same merchant, when referenced by a shippingSettingsLink in those settings. It is not meaningful to use a 'true' value for this property alongside a shippingLabel, since this property is for use with unlabelled ShippingRateSettings.
Values expected to be one of these types
Boolean
Used on these types
ShippingRateSettings

Source

https://github.com/schemaorg/schemaorg/issues/2506