Update multiple nodes in firebase

I'm using firebase with vue.js, the database let's say I have the following structure:

alumnos: {
  idkey1:{
   datos...
   asistencia:{}
  }
  idkey2:{
   datos...
   asistencia:{}
  }

}

What I want to do is send the updated data of the attendance code of each student in a single request, I could do it with a for cycle but that would make N requests to firebase