Sources: Waymo aims to expand its fleet to 8K by the end of this year, up from 4K today, and to 20K by the end of 2027, after raising $5B in debt this month (Ellen DiMauro/Semafor)

Ellen DiMauro / Semafor: Sources: Waymo aims to expand its fleet to 8K by the end of this year, up from 4K today, and to 20K by the end of 2027, after raising $5B in debt this month — THE SCOOP — As Waymo expands into new cities with its self-driving cars, the company plans to use the $5 billion it…