Also for kendo.ui.GridOptions - and everywhere. Thanks.

It's not hard.
Here's a bit to get you started:

export interface IGenericGridColumn<TModel> extends kendo.ui.GridColumn {
	template?: ((dataItem: TModel) => string)|string;
}

export interface IGenericGridOptions<TModel> extends kendo.ui.GridOptions {
	columns?: IGenericGridColumn<TModel>[];
	detailTemplate?: ((dataItem: TModel) => string)|string;
}

export interface IGenericKendoGrid<TModel> extends kendo.ui.Grid {
	getOptions(): IGenericGridOptions<TModel>;
	columns: IGenericGridColumn<TModel>[];
}