Does KPL support proxy configurations?

Question

I have Spring beans configured in a microservice as follows that I'm using to connect to Kinesis:

@Bean
// ClientConfiguration has proxy protocol, proxy host, and proxy port set
public AmazonKinesisAsync amazonKinesisAsync(ClientConfiguration clientConfiguration, AppProperties properties) {
  return AmazonKinesisAsyncClientBuilder.standard().
    withClientConfiguration(clientConfiguration).withRegion(properties.getRegion()).build();
}

@Bean
public KinesisProducerConfiguration kinesisProducerConfiguration(AppProperties properties) {
  return new KinesisProducerConfiguration()
    .setRegion(properties.getRegion());
}

This GH issue states that the KPL doesn't support proxy configuration, but I'm hoping there is a way to utilize KPL behind a firewall. So, my main question is whether or not KPL supports proxy configuration, and if not, how can I use KPL/KCL behind a corporate firewall? I've read about AWS Kinesis VPC Endpoints here, so would this be the only alternative we would have if we can't use KPL with a proxy configuration?