or you can exclude particular package from obfuscation

Ideally, since I am annotating my fields with

@SerializedName

they shouldn't get obfuscated, right?

Or is there a specific proguard rule that helps achieve this

but it shouldn’t be problem, because SerializedName has original name, so you can use it for json mapping

Why you don’t want to obfuscate such fields if you already have SerializedName?