Add third-party vector tiles in ArcGIS Online

[MalcolmMeyer2]

It would be great to utilize AGOL to display and style data from custom vector tile sources. It can already read vector tiles, but there seems to be no way to add a third-party vector tile source. 

[MalcolmMeyer2]

I figured out this is possible by replicating the Esri Vector Tile Service as partially explained here - Vector Tile Service—ArcGIS REST API: Services Directory | ArcGIS for Developers . There could be more explanation such as what do the "capabilities" refer to and definitions of all the other json keys, but nonetheless third party tiles can be added in AGOL as it stands.