A little update
I tested the snippet.
Unfortunately, I am not getting the edition I wanted.
&docid for the source document must be specified in the snippet.
the parent value didn't work for me.
examples from the snippet.docinfo.php:
[[DocInfo? &docid=`15` &field=`pagetitle`]]
[[DocInfo? &docid=`3` &field=`tvname` &render=`1`]]
[[DocInfo? &docid=`3` &templid=`2` &field=`tvname` &limit=`2`]]
So I first installed the GetField snippet again. Also works as usual with the current EVO.