Integration React Native into existing Native iOS, getting pod install error

I am trying to install pod into iOS app with following pod file data -

source 'https://github.com/CocoaPods/Specs.git'# Required for Swift appsplatform :ios, '9.0'use_frameworks!# The target name is most likely the name of your project.target 'EmbedRN' do  # Your 'node_modules' directory is probably in the root of your project,  # but if not, adjust the `:path` accordingly  pod 'React', :path => '../node_modules/react-native', :subspecs => ['Core','CxxBridge', # Include this for RN >= 0.47'DevSupport', # Include this to enable In-App Devmenu if RN >= 0.43'RCTText','RCTNetwork','RCTWebSocket', # needed for debugging    # Add any other subspecs you want to use in your project  ]  # Explicitly include Yoga if you are using RN >= 0.42.0  pod "Yoga", :path => "../node_modules/react-native/ReactCommon/yoga"  # Third party deps podspec link  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'end

getting pod install error -

pod installAnalyzing dependenciesFetching podspec for DoubleConversion from ../node_modules/react-native/third-party-podspecs/DoubleConv ersion.podspecFetching podspec for Folly from ../node_modules/react-native/third-party-podspecs/Folly.podspecFetching podspec for glog from ../node_modules/react-native/third-party-podspecs/glog.podspec

[!] CocoaPods could not find compatible versions for pod "React/Core":In Podfile:React/Core (from ../node_modules/react-native)

None of your spec sources contain a spec satisfying the dependency: React/Core (from ../node_modules/react-native).

You have either:

• out-of-date source repos which you can update with pod repo update or with pod install --repo-update .
• mistyped the name or version.

Package.json file content -

{"name": "EmbedRN","version": "0.0.1","private": true,"scripts": {"start": "node node_modules/react-native/local-cli/cli.js start"  },"dependencies": {"react": "16.13.1","react-native": "0.63.0"  }}

Project structure -