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```let margeResults = render.mergeEmail({
        templateId: '7',
        entity:{
            type: 'vendor',
            id:  parseInt(vendorBankId)
        },
        recipient: null,
        supportCaseId: null,
        transactionId: null,
        customRecord: {
            type: 'customrecord_ilo_vendor_bank',
            id: parseInt(ilVendorBankId)
        }
})```


What you need is the TemplateRenderer.addRecord() to do this. 