Does a Eurail Select Pass including only Austria & Switzerland cover the Bernina Express from Tirano to Chur?

HiI have a Eurail select pass for Austria and Switzerland and have reserved Bernina express seats separately. I am going to board Bernina exp at Tirano(Italy). Can I get my Eurail pass activated at Tirano which is in Italy and travel without paying anything extra from Tirano to Chur. Pls confirm
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