How to Use Private Sourcemaps with CRA 4?

[PCOffline]

Hey, so I read about private sourcemaps - a way to grant access to source maps only to the developers - and how they're applied using Webpack, however, this assumes you have direct access to Webpack (and/or its configuration files).

My question is, therefore, the next: Is there any option to customise the sourceMappingURL in CRA without ejecting?