Ansible: How to convert shell command output into items or variables

I am running shell command in my playbook to extract the results of a command. The output of

- debug: msg="{{ dblist.stdout_lines }}"

is

ok: [host] => {
    "msg": [
"inst1:db1"
"inst1:db2"
"inst1:db3"
"inst2:db4"
"inst2:db3"
  ]
}

I need to store this value in a format that allows me to run my next playbook considering the value of item.0 as inst1 and item.1 as db2 and so on.

Currently

- debug: msg="{{ item.0 }} has  a value {{ item.1 }}"
  with_items: "{{ dblist.stdout_lines }}"

is giving values like

ok: [host] => (item=inst1:db1) => {
    "msg": "i has  a value n"
}
ok: [host] => (item=inst1:db2) => {
    "msg": "i has  a value n"

Thanks.

For example

    - debug:
        msg: "{{ _key }} has a value {{ _val }}"
      loop: "{{ dblist.stdout_lines }}"
      vars:
        _arr: "{{ item.split(':') }}"
        _key: "{{ _arr.0 }}"
        _val: "{{ _arr.1 }}"

gives

  msg: inst1 has a value db1
  msg: inst1 has a value db2
  msg: inst1 has a value db3
  msg: inst2 has a value db4
  msg: inst2 has a value db3

If you're on a new enough version (ansible-core>=2.11), you can use the split filter:

    - debug:
        msg: "{{ item.0 }} has a value {{ item.1 }}"
      loop: "{{ dblist.stdout_lines | map('split', ':') }}"

It's possible to achieve a similar result on older versions, but it's uglier:

    - debug:
        msg: "{{ item.0 }} has a value {{ item.1 }}"
      loop: "{{ dblist.stdout_lines }}"
      loop_control:
        loop_var: _item
      vars:
        item: "{{ _item.split(':') }}"