items = [{'name': 'johnny', 'surname': 'smith', 'age': 53}, {'name':
    'johnny', 'surname': 'ryan', 'age': 13}, {'name': 'jakob', 'surname':
    'smith', 'age': 27}, {'name': 'aaron', 'surname': 'specter', 'age': 22},
    {'name': 'max', 'surname': 'headroom', 'age': 108}]
global_dict = {}
for item in items:
    for key, value in list(item.items()):
        if key not in global_dict:
            global_dict[key] = {}
if value not in global_dict[key]:
    global_dict[key][value] = 0
global_dict[key][value] += 1
print(global_dict)
item frequency in a python list of dictionaries