Text Replace with {{placeholders}}

/**
* Replaces {{placeholders}} in sentance(s).
*
* @param {A1:C1} headers The headers.
* @param {A2:C10} header_values The values below the headers.
* @param {D2:D10} sentence The text with the headernames placeholders
* @return {array} Replaces sentence(s)
* @customfunction
*/
function TEXT_REPLACE(headers, header_values, sentence) {
  if (!Array.isArray(headers)) {
    headers = [headers]
  }
  headers = headers.flat()

  if (!Array.isArray(header_values)) {
    header_values = [[header_values]]
  }

  if (!Array.isArray(sentence)) {
    sentence = [sentence]
  }
  sentence = sentence.flat()

  const results = [];
  sentence.forEach((s, i) => {
    if (s == "") {
      results.push([null])
      return;
    }

    headers.forEach((h, j) => {
      const key = `{{${h}}}`
      s = s.replace(key, header_values[i][j])
    })

    results.push([s])

  })
  return results

}