Jetpack sharing in rss feed

Jetpack itself won’t insert any buttons into your RSS feed, but you could develop your own solution thanks to the tips in this post:
https://www.wpbeginner.com/wp-tutorials/how-to-add-content-and-completely-manipulate-your-wordpress-rss-feeds/

Another solution would be to install Feedburner, since this solution offers options to add Social Media links at the bottom of your RSS feeds.