How to implement custom AU hreflang and hide/show hreflang tags via Shopify liquid.

customHreflang.liquid

{% comment %} Custom hreflang tags and hide/show hreflang tags {% endcomment %}
  {%- liquid
    assign hide_au_hreflang = false
    assign hide_uk_hreflang = false
    assign hide_jp_hreflang = false
    assign hide_ca_hreflang = false
    assign hide_nz_hreflang = false
    assign custom_href = 'https://example.com.au' | append: request.path

    if template.name == 'product'
      if product.metafields.custom.au_custom_hreflang_link != blank
        assign custom_href = product.metafields.custom.au_custom_hreflang_link
      endif
      assign hide_au_hreflang = product.metafields.custom.hide_au_hreflang.value
      assign hide_uk_hreflang = product.metafields.custom.hide_uk_hreflang.value
      assign hide_jp_hreflang = product.metafields.custom.hide_jp_hreflang.value
      assign hide_ca_hreflang = product.metafields.custom.hide_ca_hreflang.value
      assign hide_nz_hreflang = product.metafields.custom.hide_nz_hreflang.value
    elsif template.name == 'collection'
      if collection.metafields.custom.au_custom_hreflang_link != blank
        assign custom_href = collection.metafields.custom.au_custom_hreflang_link
      endif
      assign hide_au_hreflang = collection.metafields.custom.hide_au_hreflang.value
      assign hide_uk_hreflang = collection.metafields.custom.hide_uk_hreflang.value
      assign hide_jp_hreflang = collection.metafields.custom.hide_jp_hreflang.value
      assign hide_ca_hreflang = collection.metafields.custom.hide_ca_hreflang.value
      assign hide_nz_hreflang = collection.metafields.custom.hide_nz_hreflang.value
    elsif template.name == 'page'
      if page.metafields.custom.au_custom_hreflang_link != blank
        assign custom_href = page.metafields.custom.au_custom_hreflang_link
      endif
      assign hide_au_hreflang = page.metafields.custom.hide_au_hreflang.value
      assign hide_uk_hreflang = page.metafields.custom.hide_uk_hreflang.value
      assign hide_jp_hreflang = page.metafields.custom.hide_jp_hreflang.value
      assign hide_ca_hreflang = page.metafields.custom.hide_ca_hreflang.value
      assign hide_nz_hreflang = page.metafields.custom.hide_nz_hreflang.value
    elsif template.name == 'blog'
      if blog.metafields.custom.au_custom_hreflang_link != blank
        assign custom_href = blog.metafields.custom.au_custom_hreflang_link
      endif
      assign hide_au_hreflang = blog.metafields.custom.hide_au_hreflang.value
      assign hide_uk_hreflang = blog.metafields.custom.hide_uk_hreflang.value
      assign hide_jp_hreflang = blog.metafields.custom.hide_jp_hreflang.value
      assign hide_ca_hreflang = blog.metafields.custom.hide_ca_hreflang.value
      assign hide_nz_hreflang = blog.metafields.custom.hide_nz_hreflang.value
    elsif template.name == 'article'
      if article.metafields.custom.au_custom_hreflang_link != blank
        assign custom_href = article.metafields.custom.au_custom_hreflang_link
      endif
      assign hide_au_hreflang = article.metafields.custom.hide_au_hreflang.value
      assign hide_uk_hreflang = article.metafields.custom.hide_uk_hreflang.value
      assign hide_jp_hreflang = article.metafields.custom.hide_jp_hreflang.value
      assign hide_ca_hreflang = article.metafields.custom.hide_ca_hreflang.value
      assign hide_nz_hreflang = article.metafields.custom.hide_nz_hreflang.value
    endif
  -%}

  <link rel="alternate" hreflang="x-default" href="https://example.com{{ request.path }}"/>
  {% unless hide_au_hreflang %}<link rel="alternate" hreflang="en-au" href="{{ custom_href }}"/>{% endunless %}
  {% unless hide_uk_hreflang %}<link rel="alternate" hreflang="en-gb" href="https://example.uk{{ request.path }}"/>{% endunless %}
  <link rel="alternate" hreflang="en-us" href="https://example.com{{ request.path }}"/>
  {% unless hide_jp_hreflang %}<link rel="alternate" hreflang="en-jp" href="https://example.jp{{ request.path }}"/>{% endunless %}
  {% unless hide_ca_hreflang %}<link rel="alternate" hreflang="en-ca" href="https://example.ca{{ request.path }}"/>{% endunless %}
  {% unless hide_nz_hreflang %}<link rel="alternate" hreflang="en-nz" href="https://example.co.nz{{ request.path }}"/>{% endunless %}