result = {}
fios = [f'fio{x}' for x in range(4)]
objs = ['obj1', 'obj2', 'obj3']  

for obj in objs:
    result[obj] = {}
    for mounth in range(1, 13):
        result[obj][mounth] = {}
        for fio in fios:
            result[obj][mounth][fio] = {
                'status': '?',
                'hours': '?',
                'etc....': {}
            }
print(result)