The children of condemned prisoner Mary Jane Fiesta Veloso have made an emotional plea to the son of Indonesian President Joko Widodo to spare her life, ahead of her imminent execution alongside the Bali nine pair Andrew Chan and Myuran Sukumaran.

All of the 10 prisoners slated to be executed simultaneously on Nusakambangan island are now in the prison complex after Veloso, from the Philippines, was transferred overnight.

Veloso had been due to meet her children and other family members on Friday but was shifted soon after midnight from Wirogunan Penitentiary in Yogyakarta for the six-hour trip to Nusakambangan.

Her vehicle was followed by eight police cars and a number of unidentified private cars.

Earlier, her children pleaded in a video for the youngest son of Mr Joko, Kaesang Pangarep, to intervene.

"Kaesang, please help my mother. Please tell your father not to execute her," the boys, Mark Daniel and Mark Darren, told the 19-year-old Kaesang, who is active on social media.

"We beg you to lift our mother's sentence and not to execute her."

Nine of the 10 to be executed are foreigners. The sole Indonesian, Zainal Abidin, has still not received a verdict from the Supreme Court on his judicial review.

The Indonesian government plans to kill all of them simultaneously, in a mass of firing squads totalling 120 police marksmen.

Another 46 drug traffickers are due to be executed by the end of the year in a policy designed to halt country's "drug emergency". Six others were executed in January.