I have an inventories/path/hosts.yml file that has something like this, for example.

all:
  children:
    host1:
      10.10.10.1
    host2:
      10.10.10.2

Then I set this up in group_vars to set the credentials for each host.

group_vars/host1.yml
--------------------
ansible_user: admin
ansible_password: password1

group_vars/host2.yml
--------------------
ansible_user: admin
ansible_password: password2

This all works if the user runs ansible-playbook using the host name, that is, the credentials in their respective group_vars get picked up.

$ ansible-playbook -i inventories/path/hosts.yml -e var_host=host1 my_playbook.yml

How can I set this up so the respective credentials are picked up when the user passes the IP address of the host instead of label?

$ ansible-playbook -i 10.10.10.1, -e var_host=10.10.10.1 my_playbook.yml