Trying to add an invisible watermark to my page which is only visible in photographs/screenshots(Image attached) - npm

This watermark isn't visible to human eyes.(https://i.stack.imgur.com/Z5Bt5.jpg)
Found this online: https://www-npmjs-com.translate.goog/package/invisible-watermark?_x_tr_sl=zh-CN&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=sc
enter image description here
Expecting to get a watermark in a picture of the screen clicked from phone.

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