Miller and Stewart bagged 24 tries between them during the Waratahs' unbeaten Super Rugby Women's campaign that culminated with a 50-14 rout of two-time defending champions, the Fijian Drua, in Sunday's grand final.
NSW teammates Eva Karpani, Brianna Hoy, Bridie O'Gorman, Kaitlan Leaney, Atasi Lafai, Leilani Nathan, Piper Duck, Layne Morgan, Arabella McKenzie, Georgina Friedrichs and Caitlyn Halse also made the squad.
Halse is among nine international newcomers in line to make their Wallaroos debut against Canada at Allianz Stadium on May 11.Wallaroos coach Jo Yapp has included 20 players who were part of last year's O'Reilly Cup and WXV campaigns.
A further 10 development players will also join camp ahead of the opening game in Sydney.Western Force lock Michaela Leonard will continue her role as captain for the series.
Michaela Leonard takes the ball forward during the Force's Super Rugby season. (Richard Wainwright/AAP PHOTOS)
Leonard is be joined in the pack by experienced forwards Karpani, O'Gorman and Melbourne Rebels hooker Ashley Marsters while Duck returns to the squad after missing last season due to injury and captaining the Tahs to their record fifth Super crown.The other uncapped players named range from Halse's fellow teenagers Shalom Sauaso and Allana Sikimeti to 32-year-old Sally Fuesaina, who has earned a position after strong performances for the ACT Brumbies.Brumbies teammates Biola Dawa and Lydia Kavoa have also received maiden call-ups, along with Western Force duo Samantha Wood and Hera-Barb Malcolm Heke and Melbourne Rebels lock Tiarah Minns.
"The Super Rugby Women's competition has been really competitive and has given us a great opportunity to not only observe our managed group but up and coming players too," said Yapp.
"We feel the squad we have selected for the Pacific Four series gives us a good mix of experience and youth. We are really looking forward to getting into camp and kick starting the competition against Canada."We will also bring in 10 development players into the training squad for the first six days. It is important that we start to expose more players to that next level up.
"We won't know if they can take that step unless we give them the opportunity to do so."
After hosting Canada in Sydney, the Wallaroos shift to Melbourne to take on the USA at AAMI Park on May 17.Their final match of the series will be played in Auckland against New Zealand on May 25.
WALLAROOS' PACIFIC FOUR SERIES SQUAD:Allana Sikimeti, Eva Karpani, Brianna Hoy, Bridie O'Gorman, Sally Fuesaina, Hera-Barb Malcolm Heke, Tania Naden, Kaitlan Leaney, Michaela Leonard (capt), Tiarah Minns, Ashley Marsters, Atasi Lafai, Leilani Nathan,Lydia Kavoa, Siokapesi Palu, Piper Duck, Tabua Tuinakauvadra, Layne Morgan, Samantha Wood, Arabella McKenzie, Faitala Moleka, Cecilia Smith, Georgina Friedrichs, Shalom Sauaso, Trilleen Pomare, Biola Dawa, Desiree Miller, Maya Stewart, Caitlyn Halse, Lori Cramer.