Access restriction to proxypass directive

Hi all,
i’m using a reverse proxy configuration for two server on the
localhost, with different port.

Now i want to restrict the access of the public access of one
application of apache (phpmyadmin) to only some ip.
The htaccess of course do not work, because the ip is always from server
local, how to adopt the same idea of htaccess, to deny all?

Not satisfy that it is too far form what i want (no authentication) and
not limit_except that it is the inverse of what i want.