We do currently have something like this feature. If you select a piece of text and then press the bookmark button, then the bookmark text will be automatically

We do currently have something like this feature. If you select a piece of text and then press the bookmark button, then the bookmark text will be automatically filled with the selected text. Later, the bookmarks can be searched by pressing `gb' (search the bookmarks in the current document) or `gB' (search all the bookmarks).