Kendo UI Builder 2.0 provides an extensions folder where AngularJS can be added.

The attached sample uses this support to define custom high level APIs.

See the following wiki article for a description on how to use the functionality:

https://community.progress.com/community_groups/openedge_kendo_ui_builder/w/openedgekendouibuilder/2924.how-to-add-a-custom-module-and-service-in-kendo-ui-builder-2-0

Specifically, the sample AngularJS service provides an API to easily add a DropDownList component to a column in a Kendo UI Grid to provide related data. A Grid template is used to show the related data when in display mode.

The grid in the following screenshot uses the API for the State and SalesRep columns.