You can now configure ad breaks in AWS Elemental MediaTailor Channel Assembly using cue ad tags in addition to date range when using HLS outputs. When using cue ad tags, Channel Assembly will create the necessary EXT-X-CUE-IN/OUT/CONT markers in the specific HLS outputs. Additionally, you can now also configure asset metadata key/value pairs to be included in the EXT-X-ASSET tag to signal additional content characteristics on a per break basis.
Source:: Amazon AWS