Change the opacity of a hvplot quadmesh

Setting the alpha value of a

xdsi.hvplot(kind='quadmesh', rasterize=rasterize_toggle, data_aspect=1, 
            frame_height=800,cmap=cmap_sel, crs=ccrs.PlateCarree(), 
            projection=ccrs.PlateCarree(), project=True, geo=True, 
            coastline=True, global_extent=True)

seems to be harder than simply adding alpha in the hvplot constructor or chainnig .opts(alpha=0.1) at the end or even the .apply.opts(alpha=0.1). Is there a way for me to control the alpha of the quadmesh of the interactive xarray that I am currently plotting?