Custom Field Import Template for Bulk Import Template

Can you please create a bulk import template that shows the way data will look with each possible custom field format? For example, if I'm asking my users to submit a date I'd expect the top row to be custom_field[api_date]. The second row would be 2017-11-14. If I asked my users to answer a question using multiple tags I'd expect the top row to be custom_field[favorite_foods]. The second row would be burgers,hot dogs. How to format the data I've been wanting to import took me a long time to figure out, and this would've saved me a lot of time.