How could I add some external authentication method that does not use OIDC. For example Smartcard or some other custom service

[Renkas]

For example we have service called Smart-ID that we would like to add as an authentication option.

Also there is a physical smartcard based solution people use actively that we would need to implement.
More details: https://www.id.ee/en/article/web-eid/

I'm not really sure if or how could I solve this with Kratos. Is it even possible?