<configuration>
    <host_options class="com.android.tradefed.host.HostOptions">
        <option name="service-account-json-key-file" key="api-key" value="/tradefed/api-key.json"/>
        <option name="service-account-json-key-file" key="other-key" value="gs:/tradefed/other-key.json"/>
    </host_options>
</configuration>