mouseover: show picture on circle at the same with tootlip

I would like to display images on mouseover for each slice. How can I load an image from a JSON array in this script?

var data = [
{
    "str_lab": „A“,
    "num": 300,
„image: “graphics/a.svg"
},
{
    "str_lab": „B“,
    "num": 44,
„image: “graphics/b.svg"

},
{
    "str_lab": „C“,
    "num": 215,
„image: “graphics/c.svg"
},
{
    "str_lab": „D“,
    "num": 30,
„image: “graphics/d.svg"
} ];

link:  https://plnkr.co/edit/sSITuaI2ErWJjdlDbQIQ?p=preview