Graph API - Create Azure AD B2C Consumer User with external email through email invitation

I am trying to create a consumer user with their personal email id in Azure AD B2C, through graph API., along with this I also need to trigger the email with one-time passcode, so the user can do self sign up.

But unfortunately not able to find an option within the graph API, though it only allows to create of a consumer user as above along with the password. Looking for the best way to achieve this by code