Coleslaw varies so much. Lidl do a great cheese coleslaw which is very low in carbs but lots of bought ones do have added sugar. You could ask how they make theirs ?
Customer helplines that use recorded menus that promise to put me through to the right person but never do - and being ill. Oh, and did I mention customer helplines :)
Why not try the coleslaw and test your bg levels before and after eating it that you will know if it is OK for you, no one here can tell you what is in the coleslaw sold in your market only you can find that out, by testing.
Test, test and test again, its the only way you will no for sure and if its OK then why not eat it?
Certainly the safest way. I just happened to see a bottle of cole slaw sauce. 11 sugars in one tablespoon. And I might add it was HFCS!! Ya just never know.