Add new mutual property between each contacted [i][j] particles

Hello all,

Is there any simple way to add a new property as a vector [i][j] that save some an extra data for each [i][j] contacted particles ?

I know how to add new property for each particle separately, but I was wondering if there is any similar way to save property (data) as a reference for both i,j particles.

I want to save some extra contact information (e.g. number of contact, contact duration ) between each pairs, and based on this information I can set my other simulation conditions.

Any help or hints would be very appreciated.

Thanks in advance,

Senan