How can I turn an image into a 2D array in React Native?

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I am working on an ASCII art project in React Native. The user chooses an image (for example, file://image.jpg). I want to convert that image into a 2D array/list formatted like this:

[
  [{red: 40, green: 240, blue: 255},{red: 40, green: 240, blue: 255}...],
  [{red: 40, green: 240, blue: 255},{red: 40, green: 240, blue: 255}...],
  [{red: 40, green: 240, blue: 255},{red: 40, green: 240, blue: 255}...] 
]

How would I convert the image into a 2D array formatted like the one above?

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