Responsive self service (RSSP) - My requisitions - search from descriptive flexfield values

In Responsive self Service, "My requisitions" page, we would like to search requisitions based on values from Descriptive Flexfields at requisition line level.

Right now the search does not seem to work.

Is there a special way to enter the search, or an essjob to launch, or is it not implemented ?

If not implemented, will it be in a near future ?

Thanks