Unfortunately, no.
When creating a query such as return
BSL, FRA
LHR

ITA is building all 4 possible itineraries in one go
BSL LHR BSL
BSL LHR FRA
FRA LHR BSL
FRA LHR FRA
and presenting the results in one place.

With multi-city you would require at a minimum two queries for the same effect, so it’s double the work, plus the inconvenience of two results screens.