GeoJSON: how to get nested attributes?

[Zauberbutter]

I want to get a nested attribute from a GeoJSON file for a <TextSymbolizer>:

... { "tags" : { "name": "test" } } ...

With

<TextSymbolizer 
                placement="point"
                size="15"
                >[tags]</TextSymbolizer>

I get the whole string { "name": "test" }, but how can I get only tags.name?

[artemp]

@Cerberooo - nested attributes get squashed into textual representation, so no support. You might be able to use regex to match/extract relevant value from that string, not sure.
Thanks for bringing this in, I'm starting to think we should support nested attributes properly by changing internal feature representation.