How to show chosen technologies in the subtitle field in a Slack thread.

defineField({
			name: 'technologies',
			title: 'Technologies',
			type: 'array',
			of: [{ type: 'reference', to: [{ type: 'technology' }] }]
		}),

preview: {
		select: {
			customerName: 'customer.name',
			customerImage: 'customer.image',
			technologies: 'technologies.name' // want the names of the technology.
		},
		prepare(selection) {
			const { customerName, customerImage, technologies } = selection;
			const subtitleTechnologies = technologies ? technologies.slice(0, 3).join(', ') : '';

			return {
				title: customerName,
				subtitle: subtitleTechnologies,
				media: customerImage
			};
		}
	}