[keycloak-user] Client Mappers. Can I define mappers programmatically?

I have the need to define mappers programmatically instead of using fixed entries from user attributes. For example, I might want the following entries in my JWT: xxx: {d1:{[V1:123, V2:345, V3:567]},d2:{[V1:321, V2:xyz, V3:876]}} So I might have the following values in my attributes for the user: Xxx.d1.v1 123 Xxx.d1.v2 345 Xxx.d1.v3 567 Xxx.d2.v1 321 Xxx.d2.v2 xyz Xxx.d2.v3 876 But I might also have xxx.d3, xxx.d4, …. Is there a way to have Keycloak generate a JWT with all of the entries? Can I write a plug in that does this? Thank you, Reed Lewis