O Jesu mi - Oratio Fatimae in Latina - the Fatima Prayer in Latin Chant - kinda Gregorian even!

O Jesu mi, ignosce nobis, libera nos ab igne inferni,
ad caelum trahe omnes animas, praesertim maxime indigentes.
O my Jesus, pardon us, free us from infernal fires,
to heaven draw all souls, especially those in most need.
This is likely to be the closest thing to an official Latin Fatima Prayer, probably being from Bishop José Alves Correia da Silva, the Bishop of Fatima at the time.
Here's a copy:
https://littleoffice.brandt.id.au/pdf/rosary/o-jesu.pdf
and here it is in Gregobase:
https://gregobase.selapa.net/chant.php?id=18639