使用R闪亮更改传单地图的LineString样式

I have a leaflet map in R with a lot of LineStrings in it. The lines default to blue, with a certain thickness. I want to change the line color and have the thickness depend on a weight variable. I create the map by reading a geojson file. Adding a "style" section directly to each linestring feature in the geojson isn't working. Here is my R code for the map: I have a leaflet map in R with a lot of LineStr