What's a decent, human-friendly file format for property graph data?

If there is one single thing that I envy "semantic web" people for, is Turtle. Turtle is very human friendly, simple to read and to edit manually. It supports prefixes. It supports multiple graphs (TriG). It supports inline types/modifiers, for example "hello"@en and "10"^^. It supports literal vs reference links, for example :Anna :age "20"; :knows :Bob (first is a literal, second is a link to another node). It has comments. It is standard and pretty much every triplestore can parse it.

People using property graphs don't seem to have anything like this. CSV, JSON, YAML? What do you guys use? I would like to use Turtle with property graphs but the usage of URI is just awful and perhaps only 1 or 2 proprietary (non free) property graphs can read it.

I'm curious about what you property-graph people use for serialization.