How do I call a native phone feature from Flutter and make an automatic call?

I am currently developing a smartphone application on Flutter.
Among them, I was able to confirm that the screen transition from the application I was creating to the phone application and the number specified by the application side was entered in the phone number entry field.

However, it has not reached the point where it is automatically transmitted.
Is it possible to implement the automatic calling function? If possible, I would like to have references, source code, etc.