Have you visited the WordPress plugins center? There are several plugins there that may do the job for keywords. Maybe try their Search [wordpress.org] in the plugins section.
nshep
10:18 am on Nov 21, 2019 (gmt 0)
Not exactly what you are looking for but Google recently release Site Kit. It allows you to connect your site to different Google services, including Search Console, and display their data directly in the dashboard. This way, you can check what search queries your posts and pages already rank for and include some of them in your existing content.
