modal select menu

const allTextChannels = interaction.guild.channels.cache.filter(c => c.type === ChannelType.GuildText || c.type === ChannelType.GuildForum);
    const channels = allTextChannels.filter(c => allowedChannelIds.includes(c.id));

    const options = channels.map((c, i) =>
        new StringSelectMenuOptionBuilder()
            .setLabel(c.name)
            .setValue(c.id)
            .setDefault(i === 0) // first as default
    );

 const modal = new ModalBuilder()
  .setCustomId(`create_modal`)
  .setTitle('Create Private Thread')
  .addLabelComponents(
    new LabelBuilder()
      .setLabel('In Channel')
      .setStringSelectMenuComponent(
        new StringSelectMenuBuilder()
          .setCustomId('channelSelect')
          .addOptions(options)
      )
  )
  .addLabelComponents(
    new LabelBuilder()
      .setLabel('Thread message')
      .setTextInputComponent(
        new TextInputBuilder()
          .setCustomId('createThreadMessage')
          .setStyle(TextInputStyle.Paragraph)
      )
  );
await interaction.showModal(modal);