Hi, thanks for answering!
I actually decided to download the needed data using overpass api. much easier.
But theoretically, I could duplicate what OSMReader does (it uses OSMInput), but that would require processing the file twice… there’s no way to infiltrate the reading process.
About storing it, I realized I could create a GraphHopperStorage and then set the node information for each node. This way, I can even have LocationIndex to help get a list of bus station within a certain area.
I hope both of our answers would of use for someone.