[Feature] Make filter helper works with nested objects

[edtoken]

The actual implementation of the filter helper allows filtering like key=value structure,
so allows us to filter by values only of the 1 level of the object.

It could be great to have the ability to filter by nested structures.

filter (dataRaw 'my-data') (object key=(object subKey="sub-value"))

Should be possible with easy fix of the filter helper here