for each host need to print only one item - ansible

Question

I have a list of descriptions that will be added one per host. I would like to print one item per host and it is becoming harder than I expected. The same item is being printed per each host.
tasks:
- name: items in list
debug:
msg: "{{ item }}"
with_items:
- ['a', 'b']
THIS IS WHAT I GET:
TASK [items in list] *****************************************************************************************************************************************************************************************************************************
ok: [Host1] => (item=a) => {
"msg": "a"
}
ok: [Host2] => (item=a) => {
"msg": "a"
}
ok: [Host1] => (item=b) => {
"msg": "b"
}
ok: [Host2] => (item=b) => {
"msg": "b"
}
THIS IS WHAT I WANT:
TASK [items in list] *****************************************************************************************************************************************************************************************************************************
ok: [Host1] => (item=a) => {
"msg": "a"
}
ok: [Host2] => (item=b) => {
"msg": "b"
}

Answer 1

There are many options. For example,
Create lists for the hosts
- name: items in list
debug:
msg: "{{ item }}"
loop: "{{ _list[inventory_hostname] }}"
vars:
_list:
host1: ['a']
host2: ['b']
gives
ok: [host1] => (item=['a']) =>
msg: a
ok: [host2] => (item=['b']) =>
msg: b
Calculate the index of the host in the group, e.g.
- name: items in list
debug:
msg: "{{ _list[_idx|int] }}"
vars:
_list: ['a', 'b']
_idx: "{{ groups.all.index(inventory_hostname) }}"
gives
ok: [host2] =>
msg: b
ok: [host1] =>
msg: a
Run the task once and iterate the sequence, e.g.
- name: items in list
debug:
msg: "{{ _list[item|int] }}"
with_sequence: start=0 end="{{ groups.all|length -1 }}"
vars:
_list: ['a', 'b']
run_once: true
delegate_to: localhost
gives
ok: [host1 -> localhost] => (item=0) =>
msg: a
ok: [host1 -> localhost] => (item=1) =>
msg: b