REST API for Project Task Rate Overrides

Summary: We are working on an integration and need the ability to create and update Project Task Rate Overrides. This is part of Contract Management / Contracts / Billing / Bill Plan / Project Task Rate Overrides

Content (required):

The closest thing I could find was:

It contains endpoints for the following overrides, but I can't seem to find the Project Task Rate Overrides.

• Job Assignment Overrides
• Job Rate Overrides
• Job Title Overrides
• Labor Multiplier Overrides
• Non Labor Rate Overrides
• Person Rate Overrides

Am I looking in the correct location? Is it possible that an API for the Project Task Rate Overrides simply does not exist?