We used to have a workaround by inspecting the page and grabbing the raw TikTok url from the console. Then adding it as a "Video URL" to a "Video Component." But I just tested it with that component, with the "iFrame Component," and also with the "Custom Component." It looks like TikTok may have added a new blocker to prevent this type of embedding from a third party application.
We currently don't have a new way of directly embedding a TikTok video, but I wonder if it would be possible using their API.
I'll add your +1 to the feature request and will update with any updates on it.