How to set ExtraPropertiesExtension in gradle when the desired variant is executed?

Question

I set ext.myVariable as

flavor1{
ext.myVariable = "one"
}
flavor2{
ext.myVariable = "two"
}

in this snippet.

When i run assembleFlavor1 i want myVariable to be "one". But turns out to be "two". When i change the order of flavors like this

flavor2{
ext.myVariable = "two"
}
flavor1{
ext.myVariable = "one"
}

it becomes "one" as the result.

Suggestions?

Thanks in advance.