How to make tcolorboxs fill a multicol page evenly

Question

The question might sound weird due to my bad English.

In short: I want a multicol page to be filled with tcolorboxes of different heights but (visually) evenly spaced between each other.

In image: 1 no good, 2 good, 3 good More space between the boxes is also a possibility though I didn't draw. (and i'm not apologizing for my bad drawing ;D haha)

MWE:

\documentclass[twoside,12pt,openany,a4paper]{memoir}
\usepackage{multicol}
\usepackage{tcolorbox}
\tcbuselibrary{listings,skins,hooks,breakable}
\newcounter{mycounter}
\newtcolorbox[auto counter,number within=chapter,number freestyle={\noexpand\arabic{\tcbcounter}},]%
    {myFrame}[2][]{%
        enhanced,colback=white,
        colframe=black,
        boxsep=0.1pt,
        sharpish corners,
        halign=left,
        }
\begin{document}
\begin{multicols}{2}[\chapter{}]
\begin{myFrame}

Any text Any text Any text Any text Any text Any text Any text Any text.
\end{myFrame}
\begin{myFrame}

\rule{2cm}{2cm}

Small image
\end{myFrame}
\begin{myFrame}

Any text Any text Any text Any text Any text Any text Any text Any text.
\end{myFrame}
\begin{myFrame}

\rule{4cm}{4cm}

Medium image
\end{myFrame}
\begin{myFrame}

\rule{5cm}{6cm}
big image
\end{myFrame}
\begin{myFrame}[height fill]

Any text Any text Any text Any text Any text Any text Any text Any text.
\end{myFrame}

\begin{myFrame}

\rule{5cm}{6cm}
\end{myFrame}
\end{multicols}
\end{document}

I have tried the [height fill] option but the box just jumped to the next page to fill the whole column alone. I've also read about the raster distribute but doesn't seem to support different size of boxes or I simply didn't catch the idea.

Edit: I need each box to be numbered separately, they are like steps, so maybe the magazine library isn't suitable. I am typesetting a user manual.

Edit 2: Trying to use the raster, still not getting all the space used in a smart way. I also need the numbering to be top-to-bottom and not left-to-right. Check my MS Paint art:

\documentclass[twoside,12pt,openany,a4paper,]{memoir}
\usepackage{showframe}
\usepackage{multicol}
\usepackage{tcolorbox}
\tcbuselibrary{listings,skins,hooks,raster}
\newcounter{mycounter}

\newtcolorbox[auto counter,number within=chapter,number freestyle={\noexpand\arabic{\tcbcounter}},]%
    {myFrame}[2][]{%
        enhanced,colback=white,
        colframe=black,
        boxsep=0.1pt,
        sharpish corners,
        halign=left,
        }

\begin{document}
\begin{tcbitemize}[raster columns=2,raster equal height=rows,raster row skip=25pt,raster every box/.style={colframe=blue!50!black,colback=blue!10!white,colbacktitle=blue!80!white,
title={Box \# \thetcbrasternum}}]
%
\tcbitem[blankest]
\begin{tcbitemize}[raster columns=1,]
\tcbitem Any text Any text Any text Any text Any text Any text Any text Any text Any text Any text.
\tcbitem \rule{2cm}{2cm} 
\tcbitem Any text Any text Any text Any text Any text Any text Any text Any text Any text Any text.
\tcbitem \rule{4cm}{4cm}
\end{tcbitemize}
\tcbitem \rule{5cm}{6cm}
\tcbitem Any text
\tcbitem \rule{5cm}{6cm}
\end{tcbitemize}
\end{document}