We do encourage to use the new API as it is more intuitive and straightforward.
However, it is not as powerful as the legacy one, and what you are interested in is one of the few kinds of interception that the new API does not support.
We'll consider adding this ability to the new API in the future versions.
Luckily you already have a workaround using the legacy API.
legacy API isn’t discussed much in the Isolator documentation
Thank you for raising this point.
I have to agree that the legacy API is not documented as well as the new one.
But, it is available both on our site
and in the help file in the installation folder.