LaTeX letter with addresses fields are in the right place - one under another

Perhaps, this question is stupid for some users, who has more experience, but I can't find any correct option (though I re-read KOMA-Script guide section about pseudo-lengths) therefore, please, accept my apologies.

I use the class scrlttr2 for letter writing, and I want to change standard placement of addressee and sender for the following reasons: the rules of business correspondence in Russia and Ukraine prescribe the following arrangement of addresses —

                                                        ToName

FromName

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incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.


According to this topic I changed the variables toaddrvpos and toaddrhpos. And that has allowed to receive this (output of LaTeX source shown below)

The source:

\documentclass[backaddress=off]{scrlttr2}
\usepackage{cmap}
\usepackage{lipsum}
\usepackage[utf8]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage[ukrainian]{babel}

\makeatletter
\let\@texttop\relax
\makeatother

\setkomavar*{enclseparator}{Додатки}

\setkomavar{fromname}{John Doe}
Sometown, 12345}

\setkomavar{date}{\today}

\begin{document}
Town}

\opening{Dear Recipient,}

\lipsum[1]

\closing{Best Regards,}
\end{letter}
\end{document}


However, i'm stuck here and can't continue. Thanks in advance for help.

-

You can play with pseudo length. A picture of all length are shown here: How to remove space between back address and address in scrlttr2?

With the example below you will get:

\documentclass[backaddress=off,fromalign=left,version=last]{scrlttr2}
\usepackage{cmap}
\usepackage{lipsum}
\usepackage[utf8]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage[ukrainian]{babel}

\makeatletter
\makeatother

\setkomavar*{enclseparator}{Додатки}

\setkomavar{fromname}{John Doe}
Sometown, 12345}

\setkomavar{date}{\today}

\begin{document}