Support WebUI behind reverse proxy as subfolder

I have my mailpiler installation running in my internal network, without direct access from outside. For easy web-only-access I’d like to access the web-ui using mail.domain.tld/archive/. As unfortunately parts of the WebUI are using absolute URLs, it’s not easy possible to reverse-proxy the webUI from a subfolder.

I was trying to workaround it with, however without success:

location ^~ /archive/ {
    rewrite ^/archive/(.*) /\$1 break;
    proxy_set_header Accept-Encoding ""; # required to get sub_filter to work
    sub_filter '<head>' '<head>\n    <base href="/archive/">';
    sub_filter '/view' 'view';
    sub_filter_once off;
    sub_filter_last_modified on;

    proxy_http_version 1.1;
    proxy_set_header X-Real-IP         \$remote_addr;
    proxy_set_header X-Forwarded-For   \$proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto \$scheme;
    proxy_set_header Connection        "";

    proxy_read_timeout                 900;
    proxy_buffers 32 4k;
    proxy_pass https://$PILER_DOMAIN;
}

Are there any plans to use relative URLs to be able to reverse-proxy under a subfolder?

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