If I try to use your suggestion way, I found that if I input host.hostname, it just returns to "equal" or "exists" for looking my hostname. Seems like I couldn't use something like "contain" to select multiple specific hostname for my graph.
if you know all the names of the hostnames involved in a group you could create a KQL query joining them via the OR operator: host.hostname : "A" OR host.hostname: "B" ...etc
alternatively if you can express it via regex you could use a Lucene query with a RegExp - note that there are some limitations here, see the notes here
You can click on the KQL button in the popup to switch to Lucene.
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