Thank you for your clear question with attached illustration.
The Nemeth Code indentation pattern you cite applies to itemized material, which this is not. When there is no special format provided in the Nemeth Code, we follow rules and guidelines of EBAE and Braille Formats. The print document shows a table with bulleted items. It contains no displayed mathematical expressions. Follow the Literary Braille format of your choice regarding various ways to present this material. The one you are considering (1-5 and 3-7) works well.