How to find a line among a group lines which is the closest to a known point (lat,long)
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Take a look at the NeighbourFinder
Try the NeighborFinder, put the point in as base (assuming you have it as a point feature, if not use the VertexAdder to create it from lat/lon attributes) and the lines as candidates.
Note that you'll need to reproject the lines to LL84 if you're entering the point at lat/lon.