ASP.NET核心标识，如何覆盖IdentityRole名称唯一索引？我想存储与租户相关的重复名称

using Microsoft.AspNetCore.Identity;

public class CustomRole : IdentityRole
{
    // 添加与租户相关的属性
    public string TenantId { get; set; }
}

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;

public class ApplicationDbContext : IdentityDbContext<CustomRole>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
}

services.AddIdentity<ApplicationUser, CustomRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

public static class ApplicationDbContextExtensions
{
    public static void ConfigureIdentityRole(this ModelBuilder builder)
    {
        builder.Entity<CustomRole>(entity =>
        {
            entity.HasIndex(r => new { r.NormalizedName, r.TenantId }).HasName("RoleNameIndex").IsUnique(false);
        });
    }
}

protected override void OnModelCreating(ModelBuilder builder)
{
    base.OnModelCreating(builder);

    builder.ConfigureIdentityRole();
}

dotnet ef migrations add UpdateIdentityRoleIndex
dotnet ef database update