Coming from German, we have two words for "chocolate bars": The Schokoriegel which is a candy bar containing chocolate, and the Schokoladentafel, a large (often 100g) and flat slab (usually divided into pieces) of either pure chocolate or chocolate with some other ingredients. Many other languages share this distinction (eg. French tablette de chocolat vs barre chocolatée) In English, "chocolate bar" may refer to either of these, though some call the former "candy bar" instead.
How can I specifically refer to the latter kind of chocolate bars in English to avoid confusion?
People I talked to have suggested "bar of chocolate", as this implies the bar is primarily made of chocolate, but this term doesn't seem to be well accepted by internet resources. Some consider it fully synonymous with "chocolate bar"1 2, others don't recognise it at all3 4 5. From those I've seen, only Wiktionary seems to accept it with this specific meaning6.