Does my data need to be in a specific format to use Nextplot to plot routes?

Do I need to follow a specific schema in order to use Nextplot for mapping routes?

The purpose of nextplot is to be able to quickly create visualizations for arbitrary data formats.
However, there are some limitations. Most importantly it’s limited to JSON data at this point. Furthermore, there may be some structures it may not work well with at the moment. One that comes to my mind that users may actually use: referencing lon/lat of a stop by an ID. There are a number of quite exotic formats that are already supported though (e.g.: points defined in a separate file and referenced by an index).