Adding user defined, timeless geo-referenced data i.e cities

[Atseog]

Is your feature request related to a problem? Please describe.

Hello, looking for a way to add above kind of data. I've tried to add them via geojson file but it seems class GeoJSONReader requires a property 'time'.

Describe the solution you'd like

Perhaps it would be nice to have the possibility to add geojson files with timeless data into SKINNYWMS_DATA_PATH

Describe alternatives you've considered

It seems a way could be via a StaticLayer, defined in magics.py, similar to what is described here: https://confluence.ecmwf.int/display/MAGP/Symbol+examples+symbol5, but feed input_x/y_values & symbol_text_list filled with the data from a (i.e geojson) file.
I've also seen the --baselayer parameter but I got a "shp file not found" error and didn't found an example

Additional context

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Organisation

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