Jira REST Java Client 5.1 behind proxy

[Daniel]

I'm using the 5.1 client with Spring Boot, and have the following code to configure an instance of JiraRestClient with the URI and credentials

@Bean
private JiraRestClient jiraRestClient() {
    return new AsynchronousJiraRestClientFactory().createWithBasicHttpAuthentication(uri, username, password);
}

The problem is I need to use this behind a proxy. Is there any way to configure the proxy details using this java jira client? I can't find any public methods on the factory to do so