Bullet points (Key Product Features) need to be added as attributes in the Amazon configurator - it is an optional attribute called 'bullet-point' and you can add up to 5 of them. 

Assigning bullet points via Extended Properties:

1. Add relevant extended properties to the item:

2. Link extended properties in the configurator:

3. When a template is created, all the data will be pulled to the template and then to the listing:

For more information on adding attributes in the Amazon configurator, please refer to this documentation article.

Alternatively, bullet points can be added as a default value to the configurator (all listings created via the same configurator will have same details) or to the template (only this specific listing will have these details)

Articles that might be useful:

Extended Properties – priority over default value
Amazon - Bulk Listing Tool