Sharepoint Add-in and good way to get client web part id

Hi All!

I have problem with getting _wpid_ property from the hosted client web part on Sharepoint online with modern pages. It looks like I am not able to get the client web part id on modern page. Does anyone know the good way/workaround for this situation?

I can say that on Sharepoint online + classic page _wpid_ property work fine.... 

Thanks,

Greg B.