[keycloak-user] Choosing authentication method on login page

I would like to let my users have a choice which authentication method to use. For example, they could be presented with a menu to pick an option (username/pass, username/pass+OTP, etc). Then, Keycloak should, based on their choice, assign specific scope to the token. Is this possible to do with Keycloak (probably by somehow utilizing auth methods chaining) and how? I couldn't find this in documentation but it seems reasonable use-case to me. Thanks in advance, Nikola