You can add any caller as a Contact, which will recognize them as an official Phone Lead (calls lasting more than 20 seconds and that come from a unique telephone number within a rolling 31-day window are already officially counted), very easily without having to navigate to Contacts.
To add any caller to your email list:
Click Call Log.
Click Add As Contact.
Enter the contact’s First Name.
Enter the contact’s Email address.
You can click the red trash can then follow the prompts to delete any call in the Call Log.