Custom converter in JSF 2 with arguments

I'm trying to implement a custom truncate converter, which truncates a string at a given index and adds a continuation symbol. The converter works fine, only when i hard code the parameters, as they are not being passed to the backend. What am I doing wrong?

The parameters are properties of the converter class:

@FacesConverter(value = TruncateConverter.CONVERTER_ID)
public class TruncateConverter implements Converter, StateHolder
{
    public static final String CONVERTER_ID = "bla.blablabla.Truncate";

    private int truncateIndex;
    private String contSymbol;

Here is how i'm using the converter (or trying to):

<h:outputText id="news-text-left" value="#{newsListBean.newsList_teaser.text}">
    <f:converter converterId="bla.blablabla.Truncate" truncateIndex="150" contSymbol="..." />
</h:outputText>

I googled around for quite a bit and wasn't able to find a single example of a JSF2 converter with parameters... Thank you guys for your help, really appreciate it!