In your example, you need to insert your text here:
helper.h('a.icon', {
href:'/docs',
title: 'Document'
}, ["test", iconNode("book")]),
You will need to adjust the CSS on the link.
For example:
padding-inline-end: 2em;
justify-content: space-between;
color: currentcolor;

If you mean at the right:, you can try:
api.decorateWidget('home-logo:after', helper => {
return helper.h('div.d-header-icons', [
helper.h('a.icon.btn-flat.doc', {
href:'/docs',
title: 'Document'
}, [iconNode("book"), "Doc"]),
]);
});
.d-header-icons .icon.doc {
width: auto;
gap: 0.5em;
margin-inline: 1em;
& .d-icon {
width: 1em;
}
}
I tested it quickly. You might encounter some quirks, but you should get the general idea!
