The musician and producer was interviewed by Alex, Jimmy, Johnny and Charlie for this week's show about song lyrics.
Hawkes said: "I think you guys are on the right track and I think you've got every experience between you guys to actually pull it off.
"In fact, I wanna come and see you, see how you're doing in a couple of months."
The four Chartjackers received over 4,000 responses to their post about lyrics and ran their favourite contributions by Hawkes, who himself topped the charts with 'The One And Only' in 1991.
Head of digital at Hat Trick Productions Jonathan Davenport said: "Chartjackers is a guerilla, inside-out take on the talent show format exemplified by The X Factor, which pits four YouTube vloggers against the music industry as they try to bag a crowd-sourced number one single for Children in Need."
The boys are not allowed to write, record or perform anything on the track and have no money or prior music industry experience.
Chartjackers continues tomorrow at 1.10pm on BBC Two.