According to documentation https://www.zabbix.com/documentation/devel/en/manual/appendix/macros/supported_by_location, user macros for Proxy are listed as allowed only in the Interface port, Address for active agents port, and Timeouts for item types fields. This information is incomplete: according to the development, user macros are also supported in the Interface address field.

Update the documentation to include Interface address in the list of Proxy fields that support user macros.