A great question was presented in a forum:
Has anyone tested if it helps you rank for keywords if they are added to the Google Business Profile description field? If it does have an impact, has keyword stuffing in the descriptions been punished by Google?
According to everything we have seen, Google doesn't even look at the description in GBP for ranking purposes. They have specific guidelines (below) on the expected content, but it is not considered part of any ranking algorithm.
Google Guideline
(https://support.google.com/business/answer/3038177)
Content published in this field should not:
Be misleading to users. Do not provide inaccurate or false information about your business or the services and products offered.
Display low-quality, irrelevant, or distracting content. For example, misspellings, gimmicky character use, gibberish, etc.
Focus on special promotions, prices, and offer sale. Examples of content not allowed include, "Everything on sale, -50%" and "Best bagels in town for $5!"
Display links. No links of any type are allowed.
Display offensive or inappropriate content: such as harassing, bullying, or hateful content. Published content must not promote hatred or incite violence against individuals or groups based on ethnic origin, religion, disability, gender, age, veteran status, sexual orientation, or gender identity. Content may not contain obscene, profane, or offensive language. Terrorist content is not permitted, nor is sexually suggestive or explicit content. Content must not include profanity, sexually graphic and offensive slang terms, terms that are common signals for pedophilia, content that promotes pedophilia, bestiality, or sexual violence, or content that promotes escort services or other services that may be interpreted as providing sexual acts in exchange for compensation.
Display unpermitted content: Do not upload content related to the sale of dangerous and illegal products or services. Do not upload content that exploits or abuses children.
Important: Content that contains private or confidential informati9on such as personal financial information, government-issued IDs, contact information linked/associated with a name, sensitive records, images, transcripts or links that contain personal information are not allowed. The solicitation of the above information through local posts/business description other than user's own name, email and phone number is also not permitted.
If you have any questions about what is or is not allowed to be included in your GBP listing, please feel free to reach out to us at hello@localclarity.com for additional guidance.