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You can’t. It uses characters for pixels so you have either scale up your terminal or use a graphical image display.

You can use braille unicode characters for sub-character dots as in https://github.com/rastapasta/mapscii

Yes but you can’t use different colors for different dots in the same character.

If you know that you'll be zoomed way out, and have a big screen, you can fork it and change the dimensions. Terms are 80x23. I made it 40x23 to get squareish blocks. Feel free to go crazy with the dimensions and try it out.

That would be interesting, but first you'd have to write a new terminal type. And then there would be... another step or two.