On the face of it, I'd say all you need to do is add a Text field to the layout to store your keywords. You can then search this field by keyword/multiple keywords, assuming that all the keywords are in a single field, which is what I'd recommend. If the keywords are in one field, when you're doing a search (called "Find" in Filemaker terms) you could type the first few letters of multiple words to find what you're looking for. For instance, you could type "tel pro" to find all the records with keywords of "television" and "producer".
Are the keywords in your spreadsheet all in one cell? Or does each keyword exist in a separate cell? If they're separate, I would suggest that you create a calculation in your spreadsheet that copies them all into a single cell first, then import that field into the relevant field in your Filemaker solution.