We are almost there. Please click on Configure join, and as you'd expect, Left outer join Date on Date and Landing page on Landing page.
What are we asking Looker Studio here? Well, for any given day, any landing page, tell me what's the number of conversions, the total number of clicks and the number of clicks per query.
This is not perfect (you could have Organic Search sessions from outside Google, two keywords could lands on the same page), but it's our best approximation. If you wanted to be more precise even, you could use another filter, like Source = google and Medium = organic, your call here, please make some tests to see what convinces you.