app.config multiple values by single key

is it possible to have app.config file like this :

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="someKey" value="valueHere"/>
    <add key="anotherKey" value="valueHere"/>
    <add key="listOfValues">
        <value1/>
        ...
        <valueN/>
    </add>
  </appSettings>
</configuration>

I mean, I want to have a key in config file that returns a list of values.How to do it? Think it's pretty easy, but I just can't find any examples

UPD : maybe I should put multiple values separated by semicolon and then just split them?.. But I think it is not very good idea...