DNS server port configuration

Hello,
I’m trying to add a a custom DNS server. It works with the standard port 53 but I can’t make it to work with another port.
I’m using “Additional servers file” and the file contains the following :

server=/mydomain.internal/192.168.1.100#4567

It forward the requests to the right IP but on the 53 port, not on the 4567.
Am I using the wrong syntax ? In the man it is stated that

A non-standard port may be specified as part of the IP address using a # character.

(I’m using RUT360 witth firwware RUT36X_R_00.07.07.1)

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