De :help jumplist
:
When the
:keepjumps
command modifier is used, jumps are not stored in the jumplist.
Esses mapeamentos fazem o que você deseja:
nnoremap } :<C-u>execute "keepjumps norm! " . v:count1 . "}"<CR>
nnoremap { :<C-u>execute "keepjumps norm! " . v:count1 . "{"<CR>