Make a slash command private

Question

I want to make this slash command private. Where do I insert the defaultPermissions: false line?

const { SlashCommandBuilder } = require('@discordjs/builders');
const { MessageEmbed } = require('discord.js');

module.exports = {
    data: new SlashCommandBuilder()
        .setName('ping')
        .setDescription('Checks that the bot is online.'),
    async execute(interaction) {
        const embed = new MessageEmbed()
            .setColor('#9ea687')
            .setTitle('Pong!')
            .setDescription(`Latency is ${Date.now() - interaction.createdTimestamp}ms.`)
            .setThumbnail('url')
            .setTimestamp()
            .setFooter({text: 'text'});
        await interaction.reply({ embeds: [embed] });
    },
};