We are starting to pilot MS Stream in our organization and are now receiving some specific questions from our end-user community.
Thank you and best regards,
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Yammer only supports the inline play/preview of Stream (and other links) in posts, not announcements. Their composer for the announcements is different and doesn't support inline link previews, sorry. You can add your votes and comments to this idea on the Yammer User Voice forum: https://yammer.uservoice.com/forums/399627-yammer/suggestions/31638334-support-rich-media-in-annouce...
You can upload multiple subtitle tracks to a video in Stream but we don't have a way to default a specific subtitle track on via a URL parameter. You can add your votes and comments to this idea in the Stream ideas forum: https://techcommunity.microsoft.com/t5/Microsoft-Stream-Ideas/Default-to-turn-on-Captions-subtitles/...