For canned chicken salad, add a bit of lite Mayo, diced apples, halved grapes, and truvia to taste. One of the best chicken salads I ever had
For canned tuna, add a bit of lite mayo, sweet or dill relish (I prefer sweet), egg whites, and onions.
An alternative tuna salad could be a sweeter version with honey mustard, sweet relish, and yellow onions. Sometimes this needs to be balanced, and I have heard of people using Greek yogurt as a way of doing that. If you do that, you can add other sweet stuff, like dried cranberries.