Stack allocation API

[Felix Cravic]

Hello,
I was wondering if there is any plan to expose an API to do stack allocation, similarly to graal [1] but with the advantage of not depending on graal native (and the fact that project Leyden may come).
I am mostly seeking it for its potential performance aspect, which has already been discussed [2] but I do not think that the "very promising direction" has been communicated. Have any benchmark/study been done to define the usefulness of such low-level API?

[1] -
https://www.graalvm.org/sdk/javadoc/index.html?org/graalvm/nativeimage/StackValue.html
[2] -
https://mail.openjdk.java.net/pipermail/panama-dev/2019-November/006745.html