yes you are right it was a TV actually
and the content of this TV was another [[!++context setting]]
this is why it was not parsed within FormIt
I am surprised because if i put [[!*myPlacedholder]] ( or [[!*myTV]] ) directly into the html template the value is properly retrieved from the context setting and properly displayed
but when [[!*myPlacedholder]] ( or [[!*myTV]] ) is called from within !FormIt it's not computed properly
I solved this issue by directly calling the context setting instead of the TV
thanks for the help LK !