Custom Inspector that calculate percentage of some values

Hey I want to show in the Inspector the % value of the result of all the Probability that are added.

I got it to work but I dont know how to move it beside the Probability slider



This is what I got right now :

Code (CSharp):

1.  
2. using UnityEngine;
3. using UnityEditor;
4. using Sirenix.OdinInspector.Editor;
5.  
6. [CustomEditor(typeof(MobSpawner))]
7. public class CustomOdinEditor : OdinEditor
8. {
9.     SerializedProperty probability;
10.  
11.     public override void OnInspectorGUI()
12.     {
13.         base.OnInspectorGUI();
14.  
15.         MobSpawner mobSpawner = (MobSpawner)target;
16.  
17.  
18.         foreach (MobSpawn mobSpawn in mobSpawner.mobSpawns)
19.         {
20.             float totalProbability = 0;
21.             foreach (MobLootTable mobLootTable in mobSpawn.mobLootTables)
22.             {
23.                 if (mobLootTable.ForceDrop == false)
24.                 {
25.                     totalProbability = totalProbability + mobLootTable.probability;
26.                 }
27.             }
28.  
29.             foreach (MobLootTable mobLootTable in mobSpawn.mobLootTables)
30.             {
31.                 if (mobLootTable.ForceDrop == false)
32.                 {
33.                     float percentage = Mathf.Ceil(mobLootTable.probability / totalProbability * 100);
34.                     GUILayout.Label(percentage.ToString() + "%");
35.                 }
36.             }
37.         }
38.     }
39. }
40.  

Thanks !