How to get the jks for the lost keystore?

Hi,

I have a Xamarin Forms app and I lost my ketstore file

Now Google is asking me to follow below steps to recover the keystore

but the first command is asking for the jks file

Where can I get that for Xamarin Forms app?

Hi There,
Thanks for contacting Google Play Developer Support.

Now that we’ve verified your account, I’m happy to help you reset your upload key. The new upload key will be used to sign APKs that you upload to Play.

Here’s how to generate and register a new upload key:
Follow the instructions in the Android Studio Help Center to generate a new key. It must be different from any previous keys. Alternatively, you can use the following command line to generate a new key:
keytool -genkeypair -alias upload -keyalg RSA -keysize 2048 -validity 9125 -keystore keystore.jks
This key must be a 2048 bit RSA key and have 25-year validity.
Export the certificate for that key to PEM format:
keytool -export -rfc -alias upload -file upload_certificate.pem -keystore keystore.jks
Reply to this email and attach the upload_certificate.pem file.
I look forward to your response. Please let me know if you have any questions in the meantime.

Regards,
Jaden
Google Play Developer Support

Thanks,
Jassim