Can't add sub-interfaces to the network adapter. In the old version it was easy to do. If it is possible to add sub-interfaces prompt how to do it.

[Irina]

Can't add sub-interfaces to the network adapter. In the old version it was easy to do. If it is possible to add sub-interfaces prompt how to do it.
I have a vds server with one ens3 network card and 2 statistical ip addresses, I need to add a sub-interface for my second ip, but after trying all the options described in the various manuals I do not get what I need, the second ip is added to the same interface as a secondary or local.
I have:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.*.*.*/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:22:00:91:4e:41 brd ff:ff:ff:ff:ff:ff
    inet 1.1.1.1/20 brd 1.1.1.1 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::********:4e41/64 scope link
       valid_lft forever preferred_lft forever

I need to get the following:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.*.*.*/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:22:00:91:4e:41 brd ff:ff:ff:ff:ff:ff
    inet 1.1.1.1/20 brd 1.1.1.1 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::********:4e41/64 scope link
       valid_lft forever preferred_lft forever
3: ens3:0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:22:00:91:4e:41 brd ff:ff:ff:ff:ff:ff
    inet 2.2.2.2/20 brd 1.1.1.1 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::********:4e41/64 scope link
       valid_lft forever preferred_lft forever
How do I do that? Here's mine /etc/netplan/01-netcfg.yaml Ubuntu 18.04
network:
 version: 2
 renderer: networkd
 ethernets:
  ens3:
   addresses:
    - 1.1.1.1/20
   gateway4: *.*.*.*
   nameservers:
    addresses:
     - 94.8.8.8
     - 94.7.7.7
     - 77.88.8.8
     - 8.8.8.8
     - 1.1.1.1