Location to keep Ansible custom modules - ansible

Question

In the following directory structure I have to create a zip of "anisble" directory. The idea is to put everything inside the ansible directory like playbook, roles, inventory details and custom modules into a zip package and
its contents should not have any dependency on anything outside "ansible" directory.
<home>
|<user>
|__ansible
|_____playbook.yml
|_____inventory/
| |____myHosts
|
|_____library/
| |___my_Custom_module.py
|_roles
| |____role1
|____role2
I cannot use: "/home/$USER/.ansible/plugins/modules/" as this will make solution user specific and "/usr/share/ansible/plugins/modules/" is outside of the ansible directory and does need privileges(which user does not have)
Question:
Is there any possible place were my_custom_module.py can be placed so it will automatically get picked by ansible while running? This must be somewhere inside "ansible" directory.
If I do this before running the ansible playbook, it works but is there anyway to programmatically do it from ansible playbook before using the custom module ?
export ANSIBLE_LIBRARY=library/my_custom_module.py
Is there anyway I can provide the path of the custom module relative to "ansible" directory ? either in any conf file or env variable ? Note that I cannot use /etc ,/usr/ etc . Everything had to be inside ansible directory,
Is it even possible ?

Answer 1

You can create a file ansible.cfg inside of your ansible directory and then set the DEFAULT_MODULE_PATH variable (library) in that file:
[defaults]
library = ./library
More info can be found in the Ansible documentation for the Ansible configuration.
Here's what the documentation says about this setting:
Description: Colon separated paths in which Ansible will search for Modules.
Type: pathspec
Default: ~/.ansible/plugins/modules:/usr/share/ansible/plugins/modules
Ini Section: defaults
Ini Key: library
Environment: ANSIBLE_LIBRARY