Can only the priest lead the ritual of washing the feet in Holy Thursday in the Catholic Church?

On Holy Thursday I watched a broadcast from the liturgy in a small religious community in Brasil. The liturgy was led by an elderly priest. Because of the pandemic, there were less than 12 persons to have their feet washed. A lay brother was doing footwashing and at the end, a girl who was helping was doing the footwashing to the brother who was washing the feet of everybody. Another year I saw another variation of feet washing ritual on Holy Thursday, whereas in very big congregation, about 60 lay brothers were washing the feet of all people participating in the liturgy. Did it go "too far" at some point or there is no law which would forbid such practices? Where the documents explaining the current position of The Catholic Church on this ritual are to be found?