iterating through objects as key value pairs (cf. pythons .items())

sometimes it's useful to process objects by iterating through the key value pairs

python has

```
obj = {"a": 1, "b": 2}
{k:v*2 for k,v in obj.items()}
```

jq has

```
echo '{"a": 1, "b": 2}'|jq '[to_entries[]|{key: .key, value: (.value * 2)}]|from_entries'
```

is there something similar in jsonnet? it seems like the list and object comprehensions could return (k,v) tuples if the right hand side is an object