Fullscreen Pass to allow the configuration of the Outline color and Width for Unity' URP 3D Sample: https://unity.com/demos/urp-3d-sample

CockpitOutline.cs

using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

public class CockpitOutline : FullscreenEffectBase<CockpitOutlinePass>
{
}

public class CockpitOutlinePass : FullscreenPassBase
{
    public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
    {
        var volumeComponent = VolumeManager.instance.stack.GetComponent<OutlineVolumeComponent>();

        bool enabled = volumeComponent.Enabled.value;

        material.SetColor("_Color", volumeComponent.outlineColor.value);
        material.SetFloat("_OutlineWidth", volumeComponent.outlineWidth.value);
        
        if (!enabled) return;
        base.Execute(context, ref renderingData);
    }
}