To add a Bonvoy background PNG, you can use the @imgly/background-removal package. Here's an example snippet using mjml-hero to create a markdown file with the desired output:

mjml-hero
  .bonvoy-background
    img(src="https://example.com/bonvoy-background.png" alt="Bonvoy background")

This will add a Bonvoy background PNG to your markdown file. You can adjust the image source URL to match your specific use case.

Note: Make sure to install @imgly/background-removal and mjml-hero packages using npm or yarn before running this code.