I would like to have easy ability to hyperlink various sites in my multisite in the LINK menu

Hey all. My multisite has many sites at this point. When I create a LINK from the text editor, and click the option of 'link to pre-existing content', which references the individual site, I would like it to list all the content from all the sites across the network.

Example: I'm on mysite.mynetwork.com. I write a bit of text; set it for a hyperlink, and open the link menu. Instead only showing me the links available at mysite.mynetwork.com, it shows me the links available from ALL the sites, mysite(s)1,2,3,etc.mynetwork.com.