Label for inspector. Put to Editor folder

InspectorLabelEditor.cs

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

public class InspectorLabel : MonoBehaviour
{

}

[CustomEditor(typeof(InspectorLabel))]
public class InspectorLabelEditor : Editor
{
    private Color color = Color.black;
    private int size;
    private string text;


    public override void OnInspectorGUI()
    {
        var labelStyle = new GUIStyle(EditorStyles.largeLabel);

        color = EditorGUILayout.ColorField(color);
        size = EditorGUILayout.IntSlider(size, 10, 200);
        text = EditorGUILayout.TextField("text:", text);


        labelStyle.normal.textColor = color;
        labelStyle.fontSize = size;

        GUILayout.Label(text, labelStyle);
    }
}