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We do support JWT authentication in our REST connector. You can find a JSON sample for the same in our documentation below. Please refer to the "JWT: Used for authentication using JSON Web Tokens (JWT)" section of the documentation
Based on Adobe documentation, it contradicts what you have stated which is "private key and certificate expires every day" and instead it stated that it is a "One-time activity"
Snips from Adobe documentation below...
For complete details of the entire integration process, see Service Account Authentication.
Authorizing API calls
External Doc References
Creating Service Account: https://developer.adobe.com/developer-console/docs/guides/authentication/ServiceAccountIntegration/
Authentication for API Access: https://adobe-apiplatform.github.io/umapi-documentation/en/UM_Authentication.html
JWT (Service Account) Authentication: https://developer.adobe.com/developer-console/docs/guides/authentication/JWT/