configurable health checks/startupProbe for webframework deployment (Next.js SSR Cloud Run function)

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The official Firebase Support sent me to this GitHub repository due to the early preview state of web frameworks integration.

I'm using Google Firebase with Next.js. For the deployment from my local machine to Firebase `firebase experiments:enable webframeworks` comes into the play.
I haven't found an option to configure the health checks for the Cloud Run Next.js SSR function created by the Firebase webframework deployment. The configuration in the `firebase.json` file could look like:
```
"hosting": {
"source": ".",
"frameworksBackend": {
"region": "europe-west1",
"minInstances": 1,
"maxInstances": 1,
"memory": "1GiB",
"startupProbe": {
"httpGet": {
"path": "/startupProbe",
"port": 8080
},
"timeoutSeconds": 240,
"periodSeconds": 240,
"failureThreshold": 2,
"initialDelaySeconds": 3
}
},
```

There is an open question about it on [Stack Overflow](https://stackoverflow.com/a/76474703/19547647) with a solution how to achieve this manually (with some downsides).