Rest API for Adding operator in the role

Hi,

I am using below API to create a Console operator, But i am not getting any idea how i update the roles in that operator. I have created one of the role and wanted to add that test user in that role with rest API, Any help

<BESAPI xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="BESAPI.xsd">
        <Operator Resource="https://localhost:52311/api/operator/sample-operator">
                <Name>test</Name>
                <Password>Password</Password>
                <MasterOperator>false</MasterOperator>
                <CustomContent>true</CustomContent>
                <ShowOtherActions>false</ShowOtherActions>
                <CanCreateActions>true</CanCreateActions>
                <PostActionBehaviorPrivilege>AllowRestartAndShutdown</PostActionBehaviorPrivilege>
                <ActionScriptCommandsPrivilege>AllowRestartAndShutdown</ActionScriptCommandsPrivilege>
                <CanLock>true</CanLock>
                <CanSendMultipleRefresh>true</CanSendMultipleRefresh>
                <LoginPermission>Unrestricted</LoginPermission>
                <UnmanagedAssetPrivilege>ShowAll</UnmanagedAssetPrivilege>
                <InterfaceLogins>
                        <Console>true</Console>
                        <WebUI>true</WebUI>
                        <API>true</API>
                </InterfaceLogins>
                <ComputerAssignments Match="Any"></ComputerAssignments>
                </Operator>                           
                </BESAPI>