You can use it via:
1. Declaring # AdditionalJar in your project and then use JavaObject and/or inline java code.
2. Write a wrapper for it and compile it to a JAR that can be used in B4A
For both options above you will still have to study the code in the JAR (or the source code if you do have it).
If doing a wrapper you can use any text editor to write the wrapper and compile it with Simple Library Compiler (available on the forum). The output will be a JAR and XML that you can then use as library in B4A