Dropdown values from Custom Field

Hi!
It’s possible to create a dropdown menu in Contact Form 7 with values retrieved from a custom WordPress field?

In my case, I’ve create a custom filed called “Hoster” and, in several pages, I’ve inserted a different value for the same field. Now, I want to show automatically all this values in a dropdpwn inside a Contact Form and, after, sort alphabetically all this voices.

It’s possible? Thanks!