App to apk by TWA method

Hello colleagues, I want to upload my app to the Play Store. I converted my app to apk using TWA method on PWABuilder.com page

The apk works quite well (even the Google login)
But it was left with that tab up there.

So that this does not appear, it asks me to create a folder called “.well-known” and there paste a file “assetlinks.json”.
But I don’t know where to do it. Anyone who understands more about the subject and can help me?

Attached links:
Shipping a PWA as an Android app - YouTube