NO, this is not possible, unless you use ONLY this trip and NOT the trips from home to/from border=OUT and IN, normally as very first and last trip.
Also note that exactly these journeys wil cost a small fortune in extra to pay, as both €* and INTern.on SNCF -in fact if you are lucky with advance fares these may even be cheaper!
You could go around all this by using a global pass and going via BRUssel-DE=Germany, then CH=Swiss, with only paying extra for €*, but even then you pass the north of your country and hence it will not work. If you have time, this is a much more scenic trip though.
C'est pas très utile. Pour chaque destination (Londres, Turin et Barcelone) que nous voulons faire, l'application nous propose de passer par Paris. Donc le pass est mal pensé et ne sert à rien...