You can add this to your custom js:
function vLookupIsLoadedCallback(fin) {
if (fin === "vLookupTasks") {
jQuery("#dffs_vLookupTasks").find(".vLookupTasks_Status").each(function(i, td){
if(jQuery(td).text() === "New"){
jQuery(td).css({"background-color": "red", "color": "white"});
}
});
}
}
Replace vLookupTasks_Status with the internal name of your vLookup field in combination with the internal name of the field from the child list (right click and inspect the cell in your vLookup table to see the class attribute for the correct name) and then replace the two remaining vLookupTasks with the internal name of your vLookup field.
Alexander