Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
pkgconfig(protobuf)
protobuf-devel
protobuf-devel(x86-32)

Requires :

/usr/bin/pkg-config
libprotobuf.so.15
libprotoc.so.15
pkgconfig
protobuf = 3.5.0-13.el8
protobuf-compiler = 3.5.0-13.el8
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1
zlib-devel

Content of RPM :
/usr/include/google
/usr/include/google/protobuf
/usr/include/google/protobuf/any.h
/usr/include/google/protobuf/any.pb.h
/usr/include/google/protobuf/any.proto
/usr/include/google/protobuf/api.pb.h
/usr/include/google/protobuf/api.proto
/usr/include/google/protobuf/arena.h
/usr/include/google/protobuf/arena_impl.h
/usr/include/google/protobuf/arenastring.h
/usr/include/google/protobuf/compiler
/usr/include/google/protobuf/compiler/code_generator.h
/usr/include/google/protobuf/compiler/command_line_interface.h
/usr/include/google/protobuf/compiler/cpp
/usr/include/google/protobuf/compiler/cpp/cpp_generator.h
/usr/include/google/protobuf/compiler/csharp
/usr/include/google/protobuf/compiler/csharp/csharp_generator.h
/usr/include/google/protobuf/compiler/csharp/csharp_names.h
/usr/include/google/protobuf/compiler/importer.h
/usr/include/google/protobuf/compiler/java
/usr/include/google/protobuf/compiler/java/java_generator.h
/usr/include/google/protobuf/compiler/java/java_names.h
/usr/include/google/protobuf/compiler/javanano
/usr/include/google/protobuf/compiler/javanano/javanano_generator.h
/usr/include/google/protobuf/compiler/js
/usr/include/google/protobuf/compiler/js/js_generator.h
/usr/include/google/protobuf/compiler/js/well_known_types_embed.h
/usr/include/google/protobuf/compiler/objectivec
/usr/include/google/protobuf/compiler/objectivec/objectivec_generator.h
/usr/include/google/protobuf/compiler/objectivec/objectivec_helpers.h
There is 120 files more in these RPM.