i think there was a way to capture the lef map created internally, but i don't recall the instructions. if you search COS you might find it. at least that one is easy to create with the lef and ict files. the stream map is not created when you save GDS. it is an input that you need to provide. if you don't have a stream map in your PDK then hopefully you have the design rule manual for the process. there is usually a section that has the mask layers and datatypes.
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