New Position structure

Hi.

Using only template settings witout extra codding, it's not possible.

But you can easily do this using only CSS (witout overriding php files).

Using the standard Helix settings, divide the section into three columns, add the necessary positions and use the CSS Grid Technology to create any layout of these three columns

write code...

#sp-grid-layout-section .row {
    display: grid;
    grid-template-columns: 200px 1fr;
}
#sp-grid-layout-section .col-lg-4 {
    width: 100%;
}
#sp-position1 {
    grid-row: 1/3;
}

...and Boom! :)