KeyTags

Specifies that a key (i.e. a property identifier) shall be tagged and serialized as CBOR major type 6: optional semantic tagging of other major types.

Example usage:

@Serializable
data class Data(
    @KeyTags(34uL)
    val b: Int = -1   // results in the CBOR equivalent of 34("b"): -1
)

See RFC 8949 3.4. Tagging of Items.