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I am using a function from a package. When I run the function, it creates 3 different values. Now, I want to run this function for several groups and add the generated values as the unique variable (column) in the original datasets. Is there way to deal with this?

I have written many codes that looks something like this:

df <- df %>%
      group_by(group_name) %>%
      mutate(new_var = function(var1, var2, var3)

I also tried:

df <- df %>%
      group_by(group_name) %>%
      mutate(list['a', 'b', 'c']= function(var1, var2, var3)
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