Need help to develop a playbook to take vm snapshot by choosing only os disk in RHV environment

[Ramakrishna Veeragandham]

Need help to develop a playbook to select only os disk in RHV while taking VM snapshot. 

The use case to develop a playbook to take vm snapshot by choosing only os disk in RHV environment. Ansible version is 2.8 and RHV version is 4.3.

I didn't find much documentation on how to select specific disk while taking vm snapshot in rhv using 'ovirt_snapshot' module 

( https://docs.ansible.com/ansible/2.8/modules/ovirt_snapshot_module.html )