By defining Retina as 220PPI most options are excluded as 4K at 27" or 32" is common but more isn't. A look at what Apple calls Retina though shows that angular density is a much better definition. The initial presentation by Jobs was about angular resolution and the actual screens follow it. PPI ranges from 218 to 476 but angular density only between 57 to 92. So if you set a 27" or 32" screen at a decent distance y…
The better definition of "retina" is far simpler: you render UI at >1x scale on it.