In my case I have a list of dicts that contains other several list of dicts.

```
l = [{
'a': [
    { 'b': 4}
    ]
}, {
'a': [
    { 'b': 3}
    ]
}]

```

What I would technically like to do would be to sort using the path ['a'][0]['b'] using the sort filter of jinja2.

Is it possible in someway?