#list-toc-generated{
    --before-page: "";
}

.toc-element a.toc-page-after::after{
    content: var(--before-page) target-counter(attr(href), page);
    float: right;  /* put number at the right of the page */
}

.toc-element a.toc-page-before::before{
    content: var(--before-page) target-counter(attr(href), page);
    margin-right: 1ch; /* space after number */
}