playframework - Play! How to retrieve field value in a template tag having entity and the field name passed separately as parameters? -

i wanted create tag like:

#{some_tag entity:user, field:'name'} 

and expect produce output user name in using expression like:

${_entity._field} 

i know doesn't work that's why ask here. there simple way use field name passed parameter template tag field value?

i not aware of easy answer, possible. can create fast tag, , use reflection field after. can more info on fast tags here - can explain how use fasttags

however, wouldnt easier send specific field through tag?