Folder collection path based on fields

[snimavat]

We can specify path template for a folder collection - as described in docs here :
Docs says, it supports template syntax similar to slug templates
Slug templates allows use of fields

We would like to organise content based on value of certain fields (including relation type fields)

Example : City collection, with a relation field for state
We would like to configure path for cities collection as path: '{{fields.state.name}}/{{slug}}'
So that the content would be saved as shown below

- state1
   --- city1.md
   --- city2.md
- state2
   --- city3.md
   --- city4.md

But looks like, folder collection path template doesnt allow use of fields