I’m on mobile now so can’t check out your link yet, but my first suggestion is to use a URL parameter. So, when the user clicks on an address:
Navigate to index and “send additional parameters”. Set your key label to anything you want like “address” or “search” and the value to that cell’s address.
Then on index page, have a condition on the input:
When “get data from URL” is not empty > set initial content to “get data from URL”.
Now, you’ll have to click again on “get data from URL” to actually indicate which URL parameter you want to read (because you can have multiple if desired). Type in the key you set (“address” or “search” as suggested above) and the expression will actually change to “get [key] from URL”
You’ll notice that once you’ve navigated to the index after clicking on the business in the RG, your URL will have the parameter at the end. Something like “myapp.com?address=value”