I received a pointer to Write and Get Hired today. And like most busy people, I didn't read the blurb. Maybe the article will work for you, but I don't find verbalizing my goals to be helpful. I do find writing them down helpful.
But you can write and get hired. Write an article for a print or on-line magazine. Write a letter to the editor. Start (and maintain) a blog.The more you articulate your position and your strengths, the more people will realize your potential in their organization. Your writing will help you network, which will help you find a job.
If the goal things work for you, go for it. But don't neglect writing other people can see. The more you write so other people can read your writing, the more likely you are to be hired.