As far as I know, those are automatically included in the Attributes section of GMB.
I suspect attributes can be influenced by Q&As on Google Maps, Google displays a message, "know this place?answer a few questions", not to be confused with the Questions & Answers on the knowledge graph.
If your account is "bulk verified", you can upload the spreadsheet for your location/s with columns for all the attributes that you want to include. Google has a link to their attribute reference spreadsheet available when you click the bulk upload button.
my posts keep getting deleted and my links aren't working, anyways on blumenthals they talk about how you dont need to be bulk verified you need to connect through google api then you can add attributes etc. Im trying to figure it out my self Ill report back
New advertising option:
A review of your product or service posted by a Sterling Sky employee. This will also be shared on the Sterling Sky & LSF Twitter accounts, our Facebook group, LinkedIn, and both newsletters.