Load data for vegalite visualizations from file

[Veldhoen]

Currently, I either added all the data inside the vegalite spec (or I used a web URL (github raw)).
It's nicer/ more maintainable to separate the specification from the data.
I think it should be possible to use a file from the repo directly, but I'm not sure how to do this (in the context of Vue/Nuxt)

[Veldhoen]

Host data (just like map geojson)?