Yes you can but there is no real benefit to it. There may be some cleaning action but it hasn't been proven. Normally additives (not counting de-geling or similar) do one or more of three things. Improve lubrication, clean, and add cetane. ATF won't help cetane but may add a little lubrication or cleaning.
Additives in an LBZ are not necessary but if you want to run some then it is best to use something made for the purpose. With that in mind, many use 2 cycle oil to improve lubrication because it is made to burn in the cylinder with minimal deposits while ATF is formulated to resist burning
If you are trying to improve balance rates ir correct something by cleaning then there are better cleaners. Specifically the AC Delco injector cleaner but it may be on the expensive side if you can even find it. I don't think the cheaper auto parts store cleaners are really worth it and most injector issues that look to improve from cleaning are almost always temporary and cleaners won't fix worn injectors
Personality, I say skip any additives except 2 cycle if you want or anti gel for winter protection. Unless of course you can get the ATF for free. Then I say run as much as you can get (within reason)