Stick a mesh object (look-at target) to a cloth

[Fabrice]

Hi all
I made a tyflow curtain moving with a wind.

I want a character to follow a specific portion of the curtain
so I want to use a look-at constraint but the look-at need a mesh as a target.

How could I stick a mesh object to a part of a cloth object?

(Max 2025 + Tyflow 1.114)