Bivariate map within Shiny r - r

Question

Using the code below, I could create my maps of interest which work perfectly fine within my shiny dashboard. I would like to create a bivariate map by combining these two maps.
Here are the codes for the maps:
#The code below reactivates the data:
IDD_mapdata_ <- reactive ({
out_map <- IDD_nhmap %>%
filter (ProjectID %in% input$ProjectID)
return(out_map)
})
#The code below creates the first map:
output$IDD_int_map_svi <- renderLeaflet ({
npal2 <- colorNumeric(palette = "Greens",
domain = IDD_nhmap$svi)
leaflet (IDD_mapdata_(), options = leafletOptions(zoomSnap = 0.25, zoomDelta =
0.25)) %>%
addProviderTiles("CartoDB.Positron",
options = providerTileOptions(opacity = 2)) %>%
clearControls() %>%
clearShapes() %>%
addPolygons(
fillColor = ~npal2(svi),
stroke = T,
weight = 1,
smoothFactor = 0.2,
fillOpacity = 1,
color = "black",
label = labels,
labelOptions = labelOptions(
interactive = TRUE,
style = list(
'direction' = 'auto',
'color' =
'black',
'font-family' = 'sans-serif',
# 'font-style'= 'italic',
'box-shadow' = '3px 3px rgba(0,0,0,0.25)',
'font-size' = '14px',
'border-color' = 'rgba(0,0,0,0.5)'
)
),
highlightOptions = highlightOptions(
weight = 2,
bringToFront = T,
fillOpacity = 0.7
)
) %>%
setView(lng = IDD_mapdata_1()$long,
lat = IDD_mapdata_1()$lat,
zoom = 8) %>%
addLegend(
position = "topright",
opacity = 1,
values = IDD_nhmap$svi,
pal = npal2,
title = (paste("Social Vulnerability Index")) ,
labFormat = labelFormat()
) %>%
addTiles(options = tileOptions(opacity = 2))
})
#The code below generates the second map:
output$IDD_int_map1 <- renderLeaflet ({
npal2 <- colorNumeric(palette = "Greens",
domain = IDD_nhmap$Zip_Black)
leaflet (IDD_mapdata_(), options = leafletOptions(zoomSnap = 0.25, zoomDelta =
0.25)) %>%
addProviderTiles("CartoDB.Positron",
options = providerTileOptions(opacity = 2)) %>%
clearControls() %>%
clearShapes() %>%
addPolygons(
fillColor = ~npal2(Zip_Black),
stroke = T,
weight = 1,
smoothFactor = 0.2,
fillOpacity = 1,
color = "black",
label = labels,
labelOptions = labelOptions(
interactive = TRUE,
style = list(
'direction' = 'auto',
'color' =
'black',
'font-family' = 'sans-serif',
# 'font-style'= 'italic',
'box-shadow' = '3px 3px rgba(0,0,0,0.25)',
'font-size' = '14px',
'border-color' = 'rgba(0,0,0,0.5)'
)
),
highlightOptions = highlightOptions(
weight = 2,
bringToFront = T,
# color = "#666",
fillOpacity = 0.7
)
) %>%
setView(lng = IDD_mapdata_1()$long,
lat = IDD_mapdata_1()$lat,
zoom = 8) %>%
addLegend(
position = "topright",
opacity = 1,
values = IDD_nhmap$Zip_Black,
pal = npal2,
title = (paste("African Americans (ACS)")) ,
labFormat = labelFormat()
) %>%
addTiles(options = tileOptions(opacity = 2))
})