In additon to elisolution's solution previously mentioned, this also checks no matter whether we are actually on the house page (not merely whether the canonical was established or not). I tested this solution a little bit and as far as I'm able to see, it really works as envisioned. If not, https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html