This is straight from IRCC's website
"
The following documents are
mandatory for each work experience declared:
- a reference or experience letter from the employer, which
- should be an official document printed on company letterhead (must include the applicant’s name, the company’s contact information [address, telephone number and email address], and the name, title and signature of the immediate supervisor or personnel officer at the company),
- should indicate all positions held while employed at the company and must include the following details: job title, duties and responsibilities, job status (if current job), dates worked for the company, number of work hours per week and annual salary plus benefits
"
Nowhere does it say that it should be in bullet form or anything. Although it is advised to have the duties in bullet form since it's easy to follow through, its not mandatory. Hope this helps.
P.S. Don't forget to add the benefits with your other documents