geojson_layer: GeoJSON layer
In ropensci/cartographer: Interactive Maps for Data Exploration

Add a GeoJSON layer to a d3-carto-map.

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geojson_layer(carto, data, file = NULL, label = "GeoJSON",
  clickable = FALSE, fill = "lightblue", stroke = "black",
  opacity = 0.5, visible = TRUE)

`carto`	The map created by `cartographer()`.
`data`	A GeoJSON string (unparsed). The GeoJSON can be provided through the `file` parameter instead.
`file`	The path to a GeoJSON file.
`label`	The label for this layer on the layer selector.
`clickable`	Controls whether a point can be clicked to show the properties in the data frame.
`fill`	The fill color of the GeoJSON polygons, either as a name recognized by a browser or as a hexadecimal string (e.g., `#4527f3`).
`stroke`	The stroke color of the GeoJSON polygons.
`opacity`	The opacity of the GeoJSON polygons.
`visible`	Should the layer be initially visible?

# Path to a sample GeoJSON file
land <- system.file("extdata", "land.geojson", package = "cartographer")
cartographer() %>%
  geojson_layer(file = land, label = "Land")