Package not found

I cannot find this package in the package manager window.

I tried to add it manually to the package.json but I'm getting this error:

```
An error occurred while resolving packages:
  Project has invalid dependencies:
    com.unity.assetgraph: Package [com.unity.assetgraph@1.7.1] cannot be found
```

I'm on Unity 2020.2.1f1