Most modern
terminals can report mouse click positions if you ask them to.
You can try running one of the mouse-aware programs and see if
they react to mouse clicks. One of these programs is fzf. zsh
comes with zsh/curses module that supports mouse, too. You
could use it to enable mouse events -- with a dash of black
magic to handle mouse clicks in zle, you could achieve your
goal (not sure if this is possible but it sounds plausible).
If you do that, you would have to use shift-click instead of
plain click to select text. This can be annoying if you select
text in the terminal often.
Roman