I believe what you are looking for is the cp_mgmt_package module to create a new policy and new Access Control layer, then use the cp_mgmt_access_rule module to add rules.
Documentation and examples for the modules can be found here: https://docs.ansible.com/ansible/devel/collections/check_point/mgmt/index.html
Process flow:
1. Create a brand new policy package with the cp_mgmt_package module, and add the access layer at the same time.
2. Add access rules with the cp_mgmt_access_rule or cp_mgmt_access_rules modules to the access layer in the new policy package. Both modules are designed to add/modify rules to access layer policies but have their own pros/cons depending on your situation.
3. Install the new policy over the existing policy on your gateway.
4. Delete the old unused policy package, manually or with the cp_mgmt_package module.