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Feature Request: Support ProtoJson format for HTTP JSON request bodies

Feature Request: Support ProtoJson format for HTTP JSON request bodies: a task in LegoFlow-SWE (Harbor dataset). When bRPC receives HTTP requests with JSON bodies, the current JSON-to-protobuf conversion ( JsonToProtoMessage ) uses the legacy json2pb format for map fields. This format requires…

The task

When bRPC receives HTTP requests with JSON bodies, the current JSON-to-protobuf conversion (`JsonToProtoMessage`) uses the legacy `json2pb` format for map fields. This format requires maps to be represented as arrays of `{key, value}` pairs, for example:

Part of Lego-X/LegoFlow-SWE.