How to split client.signInUser into multiple HTTP requests?

[navodev]

I am trying to make it so the user sends a phone number in the first HTTP request and then it calls signInUser to send him the login code and then he can send the login code in a second request. How do I do that when the signInUser function expects the phoneCode to be a callback. I found this and tried implementing it with signInUser, but it would only send the login code after inputting a random code into the resolve.

https://stackoverflow.com/questions/73430700/telegram-client-gramjs-authentication-with-2-http-post-instead-of-callbacks