The julia package VegaLite has just been added to the official repo ( install with Pkg.add("VegaLite") ). As the name suggests it provides bindings to the VegaLite plotting library (yet another way to make graphs with Julia !). VegaLite is a simplified version of Vega which reduces the functionality but provides in turn a simpler way to define graphs (see https://vega.github.io/vega-lite/).
VegaLite uses graph descriptions in JSON but the julia syntax proposed by the package looks more like the ggplot syntax where a series of functions builds up the graph specs. You can check out the Quick tour/presentation at https://github.com/fredo-dedup/VegaLite.jl The supported backends are the standard REPL (a browser window will open), Escher and Jupyter. Issues, enhancements proposals are of course welcome !