This module can be used to gather facts on all of the VMware ESXi hosts within your cluster:

- name: Find out facts about the packages on all the ESXi hosts
  vmware_host_package_facts:
    hostname: "{{ vsphere_host }}"
    username: "{{ vsphere_username }}"
    password: "{{ vsphere_password }}"
    validate_certs: "no"
    cluster_name: "my_cluster"
  register: cluster_packages

Like the rest of the facts modules, it can also gather for just a single host:

- name: Find out facts about the packages on a single ESXi host
  vmware_host_package_facts:
    hostname: "{{ vsphere_host }}"
    username: "{{ vsphere_username }}"
    password: "{{ vsphere_password }}"
    validate_certs: "no"
    esxi_hostname: "{{ exsi_host }}"
  register: host_packages