How to insert barcode in docx using helper?

drik

I have a docx template and would like to insert barcode inside it (qrCode)
Her is what I tried, but not working. Please, can someone telle how to achieve this.
Screentip :

{{docxImage src=barcodeHerper "qrcode" data.invoiceNumber}}

helper function :

const bwipjs = require('bwip-js')

function barcodeHelper(barcodeType, text)  {    
  return bwipjs.toBuffer({
    bcid:  barcodeType,
    text:  text
  }).then(p =>  'data:image/png;base64,' + p.toString('base64'))
}

admin

See an example here
https://playground.jsreport.net/w/anon/x1IyJsyM

In handlebars, when you want to use a helper to calculate the attribute of another helper, you use () subexpressions.
https://handlebarsjs.com/guide/expressions.html#subexpressions

{{docxImage src=(barcodeHerper "qrcode" data.invoiceNumber)}}