There are two ways you can achieve this.
Create a mask for your region and the right click on the image view and select “Export Mask Pixels”, select the just created mask. Usually ‘geometry’. And then write it to a file. Maybe select to write the header.
The other option is to create specific Lat and Lon bands via Band Maths.
I’ve explained it here: Export math band + lat-lon for each pixel
Then you can export the data via File / Export /CSV
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