Add the ability to retrieve IP Addresses for an environment by API

We have a client requirement that is to automatically update an IP Allowlist for a third-party system that will be consumed by Optimizely CMS. The intention is to access a third party system using an API-Key within a header, however to ensure the system is fully secure they would like to restrict access to the system by IP address.

While we can retrieve the full list of outbound IP Addresses from within PAAS Portal, this is currently a manual process. Ideally they would like to automate the update of their IP Allowlist so that the third party API remains secure without requiring a manual process to be performed. Can this information be made available via an API call?