BackOffHandler to honor retryAfter value in case of rateLimitExceeded

We are using BackoffHandler `https://github.com/googleapis/google-api-dotnet-client/blob/55e00d18f4024a44f7007a3dbfaf6fcba4ed67f5/Src/Support/Google.Apis.Core/Http/BackOffHandler.cs#L31` to retry the errors like ratelimitExceeded / userRateLimitExceeded.

But by default, it computes time to wait using exponential backoff logic. Google API sometimes gives the retryAfter value in case of 429 http status codes.
_Ex. The service gmail has thrown an exception. HttpStatusCode is 429. User-rate limit exceeded. Retry after **2024-01-10T23:55:00.392Z**_

Is it possible to honor this Retryafter value in backOffHandler ?
Else we need to have multiple UnsuccessfulResponse handlers -
1. Default BackoffHandler for 429 or other codes without retryAfter
2. RetryAfterHandler - custom implementation to honor retry value to wait.

Please confirm if this enhancement can be possible from library side.