This approach is strongly discouraged since 6.41
Despite the fact VLAN interface supports L2 and can be bridged, It should not be used that way unles really necessary. Reason is, that it will simply tag everything including BPDU etc…
Bridge now supports VLAN tagging so you can relatively easily achieve tagging purely with the bridge between Ether1 and Ether2 where you configure Ether2 as tagged (trunk) and Ether1 as untagged (access) ports…
On the page I linked, there is presented code for correct solution so all you need is adjust it to your needs (change VLAN id and )