Add in.csproj Configuration:

    
 <PropertyGroup>
     <AndroidEnableR8>true</AndroidEnableR8>
      <AndroidLinkTool>r8</AndroidLinkTool> 
      <AndroidProguardConfig>proguard.cfg</AndroidProguardConfig 
      <AndroidSupportedAbis>armeabi-v7a;arm64-v8a;x86;x86_64</AndroidSupportedAbis>
      <DebugType>portable</DebugType>
      <DebugSymbols>true</DebugSymbols> 
      <AndroidLinkMode>SdkOnly</AndroidLinkMode>
 </PropertyGroup>

Create proguard.cfg You could check this link

build project

 dotnet build -c Release -f net8.0-android -p:AndroidPackageFormat=aab -p:DebugType=portable -p:DebugSymbols=true -p:AndroidKeyStore=true -p:AndroidSigningKeyStore=path/to/your/keystore -p:AndroidSigningStorePass=your-store-password -p:AndroidSigningKeyAlias=your-alias -p:AndroidSigningKeyPass=your-key-password

You will find

• the native files (.so) in this path

   obj\Release\net8.0-android\app_shared_libraries
  

• the mapping.text in this path

   bin\Release\net8.0-android
  

Create a ZIP file containing the debug symbols .so files

push Zip file and mapping.text file to google play console