don't use the `stat` module on each, that's too slow. Instead, do all at once

_do_paths_exist.py

# ansible module
import os
from ansible.module_utils.basic import AnsibleModule

def main():
    module = AnsibleModule(
        argument_spec=dict(
            paths=dict(type="list", required=True),
            follow=dict(type="bool", default=True),
        ),
        supports_check_mode=True,
    )
    output = {path: os.path.exists(path) for path in module.params["paths"]}
    module.exit_json(changed=False, paths_existence=output)


if __name__ == "__main__":
    main()

usage.py

# in an ansible action plugin
existence_check_results = self._execute_module(
    module_name="unity.copy_recursive._do_paths_exist",
    module_args={"paths": destination_dirs},
    task_vars=task_vars,
)
paths_existence = existence_check_results["paths_existence"]