GPX files are XML files. They are similar in layout to markup files. If there are no Plugins you will have to consider writing your own. It requires iterating the GPX file line by line and extracting the relevant information that you want to store in a thing.
If there is an existing plugin that allows you to open a file and then extract the text line by line, you can use a Backend workflow to process the texts using Regular Expression to get the coordinates, waypoint data, etc. Reference for GPX format.
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