Yes, Use the Read from File action to get the file's contents into a string variable.
If you want, you can then convert the file variable into an array, to have each line of the file in a separate array entry, using the Text Manipulation / Split to Array action: specify the variable containing the file's contents as the "Source Text" parameter; and specify \n (backslash followed by "n") as the "String Delilmiter" parameter.