Question: Gen 2:5; 15 how to get the 15 being parsed as Genesius chapter 15 instead of Gen 2:15

[Forgev41]

In a text I'm parsing there are a lot of references in the style of Gen 2:5; 15 where 15 should be interpreted as a chapter in the same book.
However it is parsed as Gen.2.5,Gen.2.15

Question: how can I get the 15 be parsed as chapter 15?