No, but the workaround is to let the launcher use a different config

We don’t have plans to support multiple accounts, but you can still run Heroic pointing to a different config folder by using the XDG_CONFIG_HOME=~/.config2 env variable. You could create a shortcut to something like XDG_CONFIG_HOME=~/.config-user-1 heroic to open Heroic for one user and XDG_CONFIG_HOME=~/.config-user-2 heroic to open Heroic for another user.