Best metric in imbalanced classification for multi-label classification
Maybe you should instead try to use some techinique to rebalance your dataset and then use a classical metric for classification problems.
Example of tchniques for rebalancing the dataset for binary classification is given in the following post:
https://stats.stackexchange.com/questions/152823/how-to-balance-my-dataset 
If you still want to work on the unbalanced dataset in the following paper some s are suggested:
https://eva.fing.edu.uy/pluginfile.php/69453/mod_resource/content/1/7633-10048-1-PB.pdf