GQL iso standard

GQL is a new Graph querying language standard. Seeing a brief description :
https://thenewstack.io/gql-a-new-iso-standard-for-querying-graph-databases/
there is major feature that lacks in SPARQL.

Property paths in SPARQL are just made of properties. This entails
limitations comparing to the GQL model where you can put a "constraint" or
the analog of a "[]" node anywhere in a path. So you can get values on
intermediary nodes, and I guess put path operators in top of that. This
seems harder or impossible to do in SPARQL.

What it would look like in sparql, for getting the patrilinear grandfather
with only a "parent" property
 ?person :parent[ :gender :male ]/:parent[ :gender :male ]
?paternalgrandfather

Also I guess one thing that is missing in property paths in sparql, the
lack of easy ways to use subproperties inside a path. You can get all the
subproperties of a property in a variable, but you can't use that variable
inside that path. For example, there are a "father", "mother" and a
"parent" property in Wikidata and it is impossible to get everything in a
single expression
 ?person [subpropertyof :parent] ?paternalgrandfather


Is there any plans to make such things possible ? I used constants in my
examples but in their expressions you can introduce variables just as in a
"[]" node used as value in a graph pattern.