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 ${__property(host1)} 

and

 
 ${__property(host2)} 

Note: Thread Groups are slightly different from other test elements, because their settings have to be determined before the test starts. This means that you cannot use variables defined in a User Parameters form. But the __property() function works in Thread Groups, and you can use variables defined on the Test Plan.

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It can be useful to put default settings into the jmeter property file, so you only need to supply differences on the command line.

 
 # defaults in jmeter.properties 
 group1.threads=10 
 group1.loops=100 
 group1.rampup=10 

Then just do jmeter -Jgroup1.loops=1000 for example.

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