How to extract the output from stdout.lines in ansible

---
- name: Mikrotik info
  hosts: mikrotik
  connection: network_cli
  remote_user: root
  gather_facts: false
  tasks:
  - name: show info
    routeros_command:
     commands: /system routerboard print
    register: rb_info

  - name: Debug info
    debug:
      msg: "{{ rb_info.stdout_lines }}"

Output:

 routerboard: yes
             model: 751G-2HnD
     serial-number: 3A6502B2A2E7
     firmware-type: ar7240
  factory-firmware: 3.0
  current-firmware: 6.42.3
  upgrade-firmware: 6.43.4

I need to filter it for "upgrade-firmware" string and get output like this:

upgrade-firmware: 6.43.4

I should use regex_replace? Or I can use grep or something like that?

Any thoughts are greatly appreciated.

Thank you

(update)

Use from_yaml and combine a dictionary. For example

    - set_fact:
        minfo: "{{ minfo|default({})|combine(item|from_yaml) }}"
      loop: "{{ rb_info.stdout_lines }}"
    - debug:
        var: minfo['upgrade-firmware']

give

  minfo['upgrade-firmware']: 6.43.4

---

(for the record)

1. Robust solution is to write the data to template and include_vars. The tasks below

    - tempfile:
      register: tempfile
    - template:
        src: minfo.j2
        dest: "{{ tempfile.path }}"
    - include_vars:
        file: "{{ tempfile.path }}"
        name: minfo
    - debug:
        var: minfo

with the template

    shell> cat minfo.j2 
    {% for item in rb_info.stdout_lines %}
    {{ item }}
    {% endfor %}

should give

    "minfo": {
        "current-firmware": "6.42.3", 
        "factory-firmware": 3.0, 
        "firmware-type": "ar7240", 
        "model": "751G-2HnD", 
        "routerboard": true, 
        "serial-number": "3A6502B2A2E7", 
        "upgrade-firmware": "6.43.4"
    }

2. The tasks below creates variable upgrade_firmware

    - set_fact:
        upgrade_firmware: "{{ item.split(':').1|trim }}"
      loop: "{{ rb_info.stdout_lines|map('quote')|map('trim')|list }}"
      when: item is search('^upgrade-firmware')
    - debug:
        var: upgrade_firmware

3. It is possible to put all the parameters into the dictionary

    - set_fact:
        minfo: "{{ minfo|default({})|
                   combine({item.split(':').0: item.split(':').1|trim}) }}"
      loop: "{{ rb_info.stdout_lines|map('quote')|map('trim')|list }}"
    - debug:
        var: minfo['upgrade-firmware']