diff --git a/pkg/cli/values/options.go b/pkg/cli/values/options.go
index 336dfb72b..1412ba7ba 100644
--- a/pkg/cli/values/options.go
+++ b/pkg/cli/values/options.go
@@ -128,7 +128,11 @@ func readFile(filePath string, p getter.Providers) ([]byte, error) {
 	// FIXME: maybe someone handle other protocols like ftp.
 	g, err := p.ByScheme(u.Scheme)
 	if err != nil {
-		return os.ReadFile(filePath)
+		data, err := os.ReadFile(filePath)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read file %s: %w", filePath, err)
+		}
+		return data, nil
 	}
 	data, err := g.Get(filePath, getter.WithURL(filePath))
 	if err != nil {
diff --git a/pkg/cli/values/options.go.orig b/pkg/cli/values/options.go.orig
new file mode 100644
index 000000000..336dfb72b
--- /dev/null
+++ b/pkg/cli/values/options.go.orig
@@ -0,0 +1,138 @@
+/*
+Copyright The Helm Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package values
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"strings"
+
+	"helm.sh/helm/v4/pkg/chart/v2/loader"
+	"helm.sh/helm/v4/pkg/getter"
+	"helm.sh/helm/v4/pkg/strvals"
+)
+
+// Options captures the different ways to specify values
+type Options struct {
+	ValueFiles    []string // -f/--values
+	StringValues  []string // --set-string
+	Values        []string // --set
+	FileValues    []string // --set-file
+	JSONValues    []string // --set-json
+	LiteralValues []string // --set-literal
+}
+
+// MergeValues merges values from files specified via -f/--values and directly
+// via --set-json, --set, --set-string, or --set-file, marshaling them to YAML
+func (opts *Options) MergeValues(p getter.Providers) (map[string]any, error) {
+	base := map[string]any{}
+
+	// User specified a values files via -f/--values
+	for _, filePath := range opts.ValueFiles {
+		raw, err := readFile(filePath, p)
+		if err != nil {
+			return nil, err
+		}
+		currentMap, err := loader.LoadValues(bytes.NewReader(raw))
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse %s: %w", filePath, err)
+		}
+		// Merge with the previous map
+		base = loader.MergeMaps(base, currentMap)
+	}
+
+	// User specified a value via --set-json
+	for _, value := range opts.JSONValues {
+		trimmedValue := strings.TrimSpace(value)
+		if len(trimmedValue) > 0 && trimmedValue[0] == '{' {
+			// If value is JSON object format, parse it as map
+			var jsonMap map[string]any
+			if err := json.Unmarshal([]byte(trimmedValue), &jsonMap); err != nil {
+				return nil, fmt.Errorf("failed parsing --set-json data JSON: %s", value)
+			}
+			base = loader.MergeMaps(base, jsonMap)
+		} else {
+			// Otherwise, parse it as key=value format
+			if err := strvals.ParseJSON(value, base); err != nil {
+				return nil, fmt.Errorf("failed parsing --set-json data %s", value)
+			}
+		}
+	}
+
+	// User specified a value via --set
+	for _, value := range opts.Values {
+		if err := strvals.ParseInto(value, base); err != nil {
+			return nil, fmt.Errorf("failed parsing --set data: %w", err)
+		}
+	}
+
+	// User specified a value via --set-string
+	for _, value := range opts.StringValues {
+		if err := strvals.ParseIntoString(value, base); err != nil {
+			return nil, fmt.Errorf("failed parsing --set-string data: %w", err)
+		}
+	}
+
+	// User specified a value via --set-file
+	for _, value := range opts.FileValues {
+		reader := func(rs []rune) (any, error) {
+			bytes, err := readFile(string(rs), p)
+			if err != nil {
+				return nil, err
+			}
+			return string(bytes), err
+		}
+		if err := strvals.ParseIntoFile(value, base, reader); err != nil {
+			return nil, fmt.Errorf("failed parsing --set-file data: %w", err)
+		}
+	}
+
+	// User specified a value via --set-literal
+	for _, value := range opts.LiteralValues {
+		if err := strvals.ParseLiteralInto(value, base); err != nil {
+			return nil, fmt.Errorf("failed parsing --set-literal data: %w", err)
+		}
+	}
+
+	return base, nil
+}
+
+// readFile load a file from stdin, the local directory, or a remote file with a url.
+func readFile(filePath string, p getter.Providers) ([]byte, error) {
+	if strings.TrimSpace(filePath) == "-" {
+		return io.ReadAll(os.Stdin)
+	}
+	u, err := url.Parse(filePath)
+	if err != nil {
+		return nil, err
+	}
+
+	// FIXME: maybe someone handle other protocols like ftp.
+	g, err := p.ByScheme(u.Scheme)
+	if err != nil {
+		return os.ReadFile(filePath)
+	}
+	data, err := g.Get(filePath, getter.WithURL(filePath))
+	if err != nil {
+		return nil, err
+	}
+	return data.Bytes(), nil
+}