It would be great, blocs can use HEIF format images 
I can understand the desire for adopting this newer format. It’s a little early in the adoption cycle…
But not fully compatible with all browsers as of this article anyway.
The only downside to using HEIF or HEIC photos is compatibility. If a piece of software can view images, it can definitely read JPEG images. But, if you take photos and end up with HEIF or HEIC files, those won’t work everywhere.
That’s why the iPhone and iPad automatically convert your photos to JPEG images when you attach them to an email or share them with a service that doesn’t support HEIF files. It also automatically converts them to JPEG when you import these photos onto a Windows PC. Apple’s iOS is designed to automatically make things as compatible as possible.
While Macs can read .HEIF and .HEIC files starting with macOS High Sierra, Windows 10 doesn’t offer built-in support for these files. You’ll need a third-party image viewer or conversion software to view the original .HEIF or .HEIC files on a Windows PC. Hopefully, Microsoft will add support for this format in the future. It’s becoming more widespread, since Google is adding support to Android, too.
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It would be cool but until the whole Internet supports HEIC natively its just another format-in-waiting.
For this to work effectively at present you would need some kind of detection script, rather like CloudFlare Pro offers with Polish. https://blog.cloudflare.com/a-very-webp-new-year-from-cloudflare/
Polish is able to take an uploaded Jpeg files and serve WebP instead when it spots the user’s web browser is Chrome. The big issue here is browser compatibility with different image file formats and knowing what to serve, rather than anything Blocs can do directly at present, but perhaps @Norm might have some magical idea to make this possible. It would certainly be a step forward, since Jpeg is definitely showing its age now.