[GraphHopper] can I add nodes and edges to the graph on the fly?

[graphhopper newbie]

Hi everybody,
I am wondering if I can add nodes and edges to the graph after its creation
in a dynamic way. I need this functionality to deal with dynamic scenarios
like representing available bikesharing/carsharing points which changes
often. The simpist case I need is to add an edge from a newly added node (
representing the available bike) to the closest node in the graph and the
reverse edge. i.e. from the closest node to the the bike node.

Thank you very much,
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