If you write a story that draws on your occupational knowledge or unique personal experience, by all means say so. Likewise if you have professional credits such as other work published, award nominations, or Clarion attendance, again, say so. It can help you get out of the big slush pile and into the little one. Don't try to flatter the editors, tell them how to market your story or why this is so much better than all the garbage they've been publishing. Just hope they like it.
Editorial Readers have to slog through hundreds of manuscripts per week.
It's not wise to make them strain to read your work. I'll say that again because it is so important. Monospace means that every letter is of the same width. The best font to use is Courier, but Times and Roman are acceptable. DO NOT use proportional fonts like Garramond, Schoolbook, Lucida, etc.