How to set text transparency (GraphicsMagick)?

Question

Node.js

Tell me how to set the transparency of text when overlaying it on an image using GraphicsMagick in Node.js

gm(path)
  .resize(width, height, '^')
  .gravity('Center')
  .crop(width, height)
  .noProfile()
  .font('ubuntu.ttf', 140)
  .fill('white')
  .drawText(0, 0, 'Text text', 'Center')
  .write(setPath),
function(err) {});

Answer 1

Understood
But only works when imagemagick is enabled

.options({"imageMagick": true})
.fill("rgba(255,255,255,0.075)")

Answer 2

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