[jharsman]

Emacs solo actually contains functionality for just that, the below snippet which allows exporting xref buffers to grep format by pressing 'E'. You can then use wgrep etc.

  ;; Makes any xref buffer "exportable" to a grep buffer with "E" so you can edit it with "e".
    (defun emacs-solo/xref-to-grep-compilation ()
      "Export the current Xref results to a grep-like buffer (Emacs 30+)."
      (interactive)
      (unless (derived-mode-p 'xref--xref-buffer-mode)
        (user-error "Not in an Xref buffer"))

      (let* ((items (and (boundp 'xref--fetcher)
                         (funcall xref--fetcher)))
             (buf-name "*xref→grep*")
             (grep-buf (get-buffer-create buf-name)))
        (unless items
          (user-error "No xref items found"))

        (with-current-buffer grep-buf
          (let ((inhibit-read-only t))
            (erase-buffer)
            (insert (format "-*- mode: grep; default-directory: %S -*-\n\n"
                            default-directory))
            (dolist (item items)
              (let* ((loc (xref-item-location item))
                     (file (xref-file-location-file loc))
                     (line (xref-file-location-line loc))
                     (summary (xref-item-summary item)))
                (insert (format "%s:%d:%s\n" file line summary)))))
          (grep-mode))
        (pop-to-buffer grep-buf)))
    (with-eval-after-load 'xref
      (define-key xref--xref-buffer-mode-map (kbd "E")
                  #'emacs-solo/xref-to-grep-compilation))

[qazxcvbnm]

My goodness, how so thoughtful Emacs Solo is!