Lost keystore file for app (but have Google Play App Signing enabled)

Seems it should work.
“Manage your app signing keys
With Google Play App Signing, you can securely manage your app signing keys for new or existing apps. Keys are stored on the same secure infrastructure Google uses to store its own keys.

If you lose your keystore or think it may be compromised, Google Play App Signing makes it possible to request a reset to your upload key. If you’re not enrolled in Google Play App Signing and lose your keystore, you’ll need to publish a new app with a new package name.”
https://support.google.com/googleplay/android-developer/answer/7384423?hl=en

Instructions at the end of the page:

“Reset your upload key
Step 1: Generate a new private key and upload certificate
Step 2: Contact our support team”

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