diff --git a/config/config.go b/config/config.go
index 1ce90dd..2bb64ce 100644
--- a/config/config.go
+++ b/config/config.go
@@ -55,8 +55,9 @@ type ProcessorConfig struct {
 }
 
 type Marker struct {
-	Name   string
-	Target TargetType
+	Name     string
+	Target   TargetType
+	HasValue bool `json:"hasValue"`
 }
 
 type TargetType string
diff --git a/processor/processor.go b/processor/processor.go
index 0b5d1f6..b1bcc9e 100644
--- a/processor/processor.go
+++ b/processor/processor.go
@@ -338,6 +338,26 @@ func (p *processor) processType(pkg *loader.Package, parentType *types.Type, t g
 		typeDef.UnderlyingType = p.processType(pkg, typeDef, underlying, depth+1)
 		p.addReference(typeDef, typeDef.UnderlyingType)
 
+	case *gotypes.Alias:
+		if typeDef.Package != pkg.PkgPath {
+			imports := pkg.Imports()
+			importPkg, ok := imports[typeDef.Package]
+			if !ok {
+				zap.S().Warnw("Imported type cannot be found", "name", typeDef.Name, "package", typeDef.Package)
+				return typeDef
+			}
+			p.parser.NeedPackage(importPkg)
+			pkg = importPkg
+		}
+
+		typeDef.Kind = types.AliasKind
+		underlying := gotypes.Unalias(t)
+		if underlying.String() == "string" {
+			typeDef.EnumValues = lookupConstantValuesForAliasedType(pkg, typeDef.Name)
+		}
+		typeDef.UnderlyingType = p.processType(pkg, typeDef, underlying, depth+1)
+		p.addReference(typeDef, typeDef.UnderlyingType)
+
 	case *gotypes.Struct:
 		if parentType != nil {
 			// Rather than the parent being a Named type with a "raw" Struct as
@@ -536,9 +556,19 @@ func mkRegistry(customMarkers []config.Marker) (*markers.Registry, error) {
 			continue
 		}
 
-		if err := registry.Define(marker.Name, t, struct{}{}); err != nil {
+		var d *markers.Definition
+		var err error
+		if marker.HasValue {
+			d, err = markers.MakeAnyTypeDefinition(marker.Name, t, crdmarkers.Default{})
+		} else {
+			d, err = markers.MakeDefinition(marker.Name, t, struct{}{})
+		}
+		if err != nil {
 			return nil, fmt.Errorf("failed to define custom marker %s: %w", marker.Name, err)
 		}
+		if err := registry.Register(d); err != nil {
+			return nil, fmt.Errorf("failed to register custom marker %s: %w", marker.Name, err)
+		}
 	}
 
 	return registry, nil
@@ -556,7 +586,6 @@ func parseMarkers(markers markers.MarkerValues) (string, []string) {
 
 	for _, name := range markerNames {
 		value := markers[name][len(markers[name])-1]
-
 		if strings.HasPrefix(name, "kubebuilder:validation:") {
 			name := strings.TrimPrefix(name, "kubebuilder:validation:")