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It is not possible to convert Protobuf to JSON without using quotation marks as JSON is a text-based format that requires string values to be enclosed in quotation marks. However, there are some libraries and tools that can generate JSON with minimized quotation marks, which can reduce the size of the output file. One such tool is the protoc-gen-jsonpb plugin for the Protobuf compiler, which generates JSON output that uses minimal quoting for string values.