SSO OIDC + signing orders

Question:
We have recently configured an eID hub using OIDC protocol.
Previously we were already using Signicat to sign documents, and now we are trying to avoid the second authentication by the end-user, if they have already identified themselves using the eID.
I have checked the authentication properties in the Task when we generate the order to sign, but I was not able to find a documentation to follow, in order to implement this complete flow of authentication + signature.
Is it possible to get that users not having to log twice?
Thanks in advance