SetTextで文字を表示する場合

ShowCharacter3.cs

using UnityEngine;
using TMPro;

public class ShowCharacter3 : MonoBehaviour
{
    [SerializeField]
    TextMeshProUGUI label;

    public int Count;

    void Update()
    {
        var value = Count;
        label.SetText("<size=50%>value</size> {0}", Count);
    }
}