Yeah, the display is 240x240, that would be 57k even at 8 bit per pixel color depth, almost as much as the nRF52832's 64k memory. So you can't read it back to memory in one go.
It's probably doable: read a chunk of data from the LCD's memory, push it thru BLE, read the next chunk. But it won't be fast, Espruino's effective transfer rate is about 2.6kbyte / sec.
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