// abc[100], Tba_a[0].
var listObjRex = regexp.MustCompile(`^([a-zA-Z]?[a-z_A-Z\d]*)\[([ ]*[\d]+)[ ]*\]$`)

func getConfigValue(path []string, val map[string]*structpb.Value) *structpb.Value {
	retVal := structpb.NewNullValue()
	if len(path) > 0 {
		match := listObjRex.FindStringSubmatch(path[0])
		// valid list index
		switch len(match) {
		case 0: // does not match list object selection, should be name of a field, should be struct value