Since it's a wrapper, you can choose the same license as for the wrapped library, or a compatible one, i.e "Apache License, Version 2.0 (the "License")"
Note, it doesn't have such a file (maybe why you do not), I just found in the readme.
You could choose more lax MIT, or even something more strict, but if simply not the same then please mention the license of the wrapped code in the same file.
Since it's a wrapper, you can choose the same license as for the wrapped library, or a compatible one, i.e "Apache License, Version 2.0 (the "License")"
assuming I found the code you're wrapping:
https://github.com/ML-KULeuven/problog
Note, it doesn't have such a file (maybe why you do not), I just found in the readme.
You could choose more lax MIT, or even something more strict, but if simply not the same then please mention the license of the wrapped code in the same file.