Way to add proxy host settings for repository-gcs plugin in ES 7.5.2?

Is there a way to provide proxy.host and proxy.port for repository-gcs plugin. The same can be easily done for repository-s3 by setting the following in elasticsearch.yml:

s3.client.default.protocol: http
s3.client.default.proxy.host: xyz.abc.net
s3.client.default.proxy.port: xxxx

Is there something similar for repository-gcs or any other workaround?