The title Our Lady of All Nations is a title. As far as official teachings of the Catholic Church, the Magisterium has never official consider this as part of the deposit of faith. This is a title. This may be an “approved apparition” but is not part of our teaching.
Approved apparition are consider “private revelation.”
The Catechism states:
CCC 67 Throughout the ages, there have been so-called “private” revelations, some of which have been recognized by the authority of the Church. They do not belong, however, to the deposit of faith. It is not their role to improve or complete Christ’s definitive Revelation, but to help live more fully by it in a certain period of history. Guided by the Magisterium of the Church, the sensus fidelium knows how to discern and welcome in these revelations whatever constitutes an authentic call of Christ or his saints to the Church.
Christian faith cannot accept “revelations” that claim to surpass or correct the Revelation of which Christ is the fulfillment, as is the case in certain non-Christian religions and also in certain recent sects which base themselves on such "revelations.
There is no need to make this title into a dogma.