ChromeOS is already capable of running Android apps.
What makes a laptop a laptop is a decent keyboard and a reasonably large screen. There is a fundamental mismatch between the screen size comfortable for the eyes, keyboard size comfortable for typing, and device size comfortable for holding in hand. Because of this, I don't think phones and laptops will ever converge; tablets and laptops are already actively converging, though.
So, you simply need to add an optional large screen, keyboard, and mouse to your phone. It has already been done. Now it just needs to be done a little better?
See also: Microsoft Continuum, Motorola Atrix (probably the first Android that turned into a laptop)
Yay, and with Emui and DeX growing up, it seems to be next revolution about smartphones replacing your PC's. For instance, the Mirabook from Miraxess : https://miraxess.com/samsung-note-8-laptop/
Ideally, Android and iOS will evolve so phones and tablets replace the desktop for more people.