Count number of occurrences of each unique element in a list in ansible

How can I count how many times is repeated each item in a list?

    list:
      - 5.8.3
      - 5.8.4
      - 5.8.4
      - 5.9.2
      - 5.9.2
      - 5.9.2

I want to print something like this:

    list_counter:
      5.8.3: 1
      5.8.4: 2
      5.9.2: 3

I tried something like this, but no success

    - set_fact:
        list_counter: '{{ item : 1 + item.get(unique_int[item],0) }}'
      loop: "{{ list }}" 

• Use community.general.counter if you can install latest collection Community.General

list_counter: "{{ list | community.general.counter }}"

gives the expected result

list_counter:
  5.8.3: 1
  5.8.4: 2
  5.9.2: 3

• If you're not able to install the collection take the code and create a custom filter plugin

shell> cat filter_plugins/my_counter.py 
# -*- coding: utf-8 -*-
# Copyright (c) 2021, Remy Keil <remy.keil@gmail.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from ansible.errors import AnsibleFilterError
from ansible.module_utils.common._collections_compat import Sequence
from collections import Counter


def my_counter(sequence):
    ''' Count elements in a sequence. Returns dict with count result. '''
    if not isinstance(sequence, Sequence):
        raise AnsibleFilterError('Argument for community.general.counter must be a sequence (string or list). %s is %s' %
                                 (sequence, type(sequence)))

    try:
        result = dict(Counter(sequence))
    except TypeError as e:
        raise AnsibleFilterError(
            "community.general.counter needs a sequence with hashable elements (int, float or str) - %s" % (e)
        )
    return result


class FilterModule(object):
    ''' Ansible counter jinja2 filters '''

    def filters(self):
        filters = {
            'my_counter': my_counter,
        }

        return filters

Use it

list_counter: "{{ list | my_counter }}"

• The declaration below gives the same result if you don't want to use collections or write a custom filter

list_counter: "{{ dict(data | unique |
                       zip(data |
                           json_query('[].{key:@, value: `1`}')|
                           groupby('key') |
                           map(attribute=1) |
                           map('map', attribute='value') |
                           map('sum') | list)) }}"