diff --git a/pkg/config/common.go b/pkg/config/common.go
index 132c6709..56838e15 100644
--- a/pkg/config/common.go
+++ b/pkg/config/common.go
@@ -124,11 +124,16 @@ func MoveToStatus(sch *schema.Resource, fieldpaths ...string) {
 	}
 }
 
+func (r *Resource) MarkAsRequired(fieldpaths ...string) {
+	r.requiredFields = append(r.requiredFields, fieldpaths...)
+}
+
 // MarkAsRequired marks the schema of the given fieldpath as required. It's most
 // useful in cases where external name contains an optional parameter that is
 // defaulted by the provider but we need it to exist or to fix plain buggy
 // schemas.
-// Deprecated: Use RequiredFields API instead.
+// Deprecated: Use Resource.MarkAsRequired instead.
+// This function will be removed in future versions.
 func MarkAsRequired(sch *schema.Resource, fieldpaths ...string) {
 	for _, fieldpath := range fieldpaths {
 		if s := GetSchema(sch, fieldpath); s != nil {
diff --git a/pkg/config/resource.go b/pkg/config/resource.go
index bfe6b746..160ca70f 100644
--- a/pkg/config/resource.go
+++ b/pkg/config/resource.go
@@ -162,10 +162,6 @@ type ExternalName struct {
 	// management policy is including the Observe Only, different from other
 	// (required) fields.
 	IdentifierFields []string
-
-	// RequiredFields are the fields that are marked as required, although
-	// it is not required in the TF schema.
-	RequiredFields []string
 }
 
 // References represents reference resolver configurations for the fields of a
@@ -493,6 +489,14 @@ type Resource struct {
 	// the value of the generated Kind, for example:
 	// "TagParameters": "ClusterTagParameters"
 	OverrideFieldNames map[string]string
+
+	// requiredFields are the fields that will be marked as required in the
+	// generated CRD schema, although they are not required in the TF schema.
+	requiredFields []string
+}
+
+func (r *Resource) RequiredFields() []string {
+	return r.requiredFields
 }
 
 // ShouldUseTerraformPluginSDKClient returns whether to generate an SDKv2-based
diff --git a/pkg/types/field.go b/pkg/types/field.go
index 8e74de97..61e2afae 100644
--- a/pkg/types/field.go
+++ b/pkg/types/field.go
@@ -121,7 +121,7 @@ func NewField(g *Builder, cfg *config.Resource, r *resource, sch *schema.Schema,
 		}
 	}
 
-	for _, required := range cfg.ExternalName.RequiredFields {
+	for _, required := range cfg.RequiredFields() {
 		if required == snakeFieldName {
 			f.Required = true
 		}