shippingLabel

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

Thing > Property > shippingLabel

Label to match an OfferShippingDetails with a ShippingRateSettings (within the context of a shippingSettingsLink cross-reference).
Values expected to be one of these types
Text
Used on these types
OfferShippingDetails
ShippingRateSettings

Source

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