Calculate list fielf items within columns

I a NEW TO THIS GRAVITY FROM . just wanted to ask . There’s list field that I know I can add more items as needed with ( + ) button at the end thats useful
Question : My List Field actually got 2 column - First is ADDTIONAL ITEMS - Second Column is $COST ( ROCK _____________ $5 ) ( Fabric __________ $3 ) ( Pins _____________ $1 ) How do I Calcualte those ? … ( $5 +$3 + $1 ) . Is it possible with gravity forms in the list field ? ( I CAN DO IT WITHOUT LIST FIELD . BUT IS IT POSSIBLE FOR LIST FIELD TO COUNT LIKE THAT ? )
HOPE TO GET ANY HELP FROM PRO

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