"SAME APP" as OneCalendar but for CONTACTS

Could you please please please make a similar apps as OneCalendar but for CONTACTS. It would combine @gmail contacts with @outlook and so on, without actually merging them. Just showing both account on the same interface... and with an integrated dialer or linked to the phone native one.

The native contact app on my old Samsung Galaxy S3 did just that superbly... but I now have a Google Pixel 2 and the native contact app does not support combining an @outlook contact list with a @gmail one (strongly suspect this is on purpose by google and/or microsoft). I had to export all my outlook contacts to gmail, and from now on, add any new contact to gmail, while I would like to be able to segregate my contacts between the two accounts but still have a combine view EXACTLY  like OneCalendar does for calendars… please please please

I searched A LOT for such an app, as I did for calendars. Unfortunatly, this time my search was vain since I did not find a "OneContact" app... until you make one.... please