How do platelets produce proteins (if they do)?

I’m aware that platelets don’t contain a nucleus, but do contain mitochondria (so have mtDNA) and rough endoplasmic reticulum / Golgi. Since platelets require many important cell surface proteins (such as aIIb b3 for ECM binding), are these proteins (1) synthesized de novo in the mitochondria using mtDNA, and then somehow shuttled to the ER / Golgi for secretion, (2) remnants from proteins that were synthesized in their megakaryocyte precursors and not actually created anew, or (3) synthesized via some other mechanism I’m not aware of? Online sources weren’t clear on this question. Thanks!