@Juhi Chawla2 

you simply check the table name or class name like this and print the table name/HR Service

(function runMailScript( /* GlideRecord */ current, /* TemplatePrinter */ template,
    /* Optional EmailOutbound */
    email, /* Optional GlideRecord */ email_action,
    /* Optional GlideRecord */
    event) {

    template.print('HR COE is: ' + current.hr_service.topic_detail.topic_category.coe);

})(current, template, email, email_action, event);

In your notification call this email script

${mail_script:my_coe_table}

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