route only 1 ip from VLAN into bridge

Hi I have the folowing problem:

I have 1 VLAN with id 3999 for IPTV and untagged vlan for PPPoE Internet

my local bridge has gateway: 192.168.88.1 and there is also DHCP Server and DNS Server on it

but I would like to acsess timeshift streams which are only available on IPTV VLAN 3999 on 10.253.7.115 not on PPPoE Untagged VLAN 0

I’ve setup VLAN tag on ether1 (WAN SIDE) and my test computer is connected to ether2 (LAN Side)

so I would like to route this ip: 10.253.7.115 (which has RSP Stream on it) and is only acsessible on VLAN 3999 to LAN Side without VLAN Tag but I don’t know what is the best way to do this

Thanks for Anwsering and Best Regards