Bookmarklets support for IndieBlocks.
Install and activate. Visit “Tools > IndieBlocks Bookmarklets” for draggable, well, bookmarklets. These currently assume you have both post types (i.e., notes and likes) enabled.
Tweak as needed. (E.g., update the post_type query argument to better suit your setup.)
Selected text is sanitized—use at your own risk, though!—and then copied into the relevant block’s inner blocks.