Reference: Placement involving named lines

    grid-template-columns: [A-start] 60px [A-start] 60px 60px;
    grid-template-areas: "B . . . A";
    grid-auto-columns: 40px;
    grid-gap: 1px;

    grid-column-start:

-1 4 -2 -3 -4 -5 A -1 B -1 A -2 A -3 A -4 A -5 A B A 1 A 2 A 3 A 4 A 5

    grid-column-end:

-1 4 -2 -3 -4 -5 A -1 B -1 A -2 A -3 A -4 A -5 A B A 1 A 2 A 3 A 4 A 5

    grid-column: / span A-start 2

-1 4 -2 -3 -4 -5 A -1 B -1 A -2 A -3 A -4 A -5 A B A 1 A 2 A 3 A 4 A 5