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Soft mouth should be an innate characteristic of a good Lab. Always reward pup for a speedy retrieve, don't play tug, and keep designated chew toys distinct and separate from retrieving toys.
A "forced fetch" can be taught as part of formal training after the secondary teeth set, but it's pretty intense. Best done by a pro, or with a very light touch.
My last Lab didn't need it. I tried, he was like" WTF? Get me off this table and just throw the goddamn thing."
This one needed it. Within a month he went from an incorrigible disobedient Alpha wannabe to my bestest and loyalist friend.