campfire/Assets/Scripts/AutoListPositioner.cs

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

[ExecuteAlways]
public class AutoListPositioner : MonoBehaviour {
    public float Padding;
    public List<float> SpecificPaddings;

    private void Update() {
        if (!Application.isPlaying) {
            for (int Index = SpecificPaddings.Count; Index < transform.childCount - 1; Index++) {
                SpecificPaddings.Add(Padding);
            }

            RectTransform Parent = GetComponent<RectTransform>();
            float Y = Parent.position.y;
            for (int Index = 0; Index < transform.childCount; Index++) {
                RectTransform Child = transform.GetChild(Index).GetComponent<RectTransform>();
                if (Child) {
                    Child.position = new Vector2(Child.position.x, Y);
                    if (Index < SpecificPaddings.Count) {
                        Y -= Child.rect.height + SpecificPaddings[Index];
                    }
                } else {
                    Debug.LogWarning($"AutoListPositioner {name} has non-UI children!");
                }
            }
        }
    }
}