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Constructs legend elements into the correct JSON format for plotting on the map
mapdeck_legend(legend_elements)
vector of legend elements (made from legend_element)
legend_element
l1 <- legend_element(
variables = c("a","b")
, colours = c("#00FF00","#FF0000")
, colour_type = "fill"
, variable_type = "category"
, title = "my title"
)
mapdeck_legend(l1)
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