Suffix support?

Hi, it would be nice if there was a global suffix support.

This is how I imagine it could work API-wise:

Root level, producing `MyApp`.
```

...

```

Inside a specific page, producing `Index | MyApp`.
```

...

```

There could be also custom format function for those who need more power:
```
value ? value+' | MyApp' : 'MyApp'}>
...

```