Thoupheguerr98
This and all similar questions are answered on this area of validity map
Make sure to select the correct applicable travel pass in that box in the top left map corner first, in your case probably Saver Day Pass without Half Fare Travelcard. Also check the meanings of line types and colors by clicking that (i) info button.
Then navigate to Grindelwald and zoom in almost to the maximum: You’ll see that the cable car to First, once it has appeared, is displayed as a solid grey line (meaning not included and no discount).
Also note that due to yesterday’s storm damages, Grindelwald is currently more difficult to access than usually, see https://community.sbb-tickets.cc/d/29165-info-line-closure-interlaken-ost-grindelwald-until-further-notice