One entry of a [bb_legend()].
Examples
legend_key("swatch", "<80%", "#C8503F")
#> $type
#> [1] "swatch"
#>
#> $label
#> [1] "<80%"
#>
#> $color
#> [1] "#C8503F"
#>
#> $state
#> NULL
#>
#> attr(,"class")
#> [1] "bb_legend_key"
legend_key("status", "Meets", state = "yes")
#> $type
#> [1] "status"
#>
#> $label
#> [1] "Meets"
#>
#> $color
#> NULL
#>
#> $state
#> [1] "yes"
#>
#> attr(,"class")
#> [1] "bb_legend_key"