Google have https://firebase.studio (originally idx.dev), which they recently updated, so I'd assume that they wouldn't want to cannibalize that.
Then again there's also Android Studio, so what do I know. (not a lot)
2. Even if it's thinkable in last 4-5 years due to raising Popularity of web IDE, Android studio was built before that and they chose the IntelliJ platform.
3. Google also has flutter and go.