TIDA-010257: doubt regarding input

Part Number: TIDA-010257

The current documentation outlines a 3-phase, 4-wire Vienna PFC configuration. I am looking to implement this design in a 3-wire system without a neutral line. What hardware modifications and software/control adjustments (such as Phase-Locked Loop or decoupling adjustments) are necessary to transition this reference design from 4-wire to 3-wire operation?