wpgraft does not care that a language model wrote the HTML, or what framework it used. It reads the page as your browser rendered it: the real elements and the real computed styles on each one, at every width you ask for. It then builds that as a Shopify section made of theme blocks, with every style in one of the blocks’ own settings. Nothing that arrives depends on Lovable still being there.
The awkward part of building a store page with Lovable was never the generating. It is that what comes out is code, and a Shopify theme wants sections and blocks a merchant can edit. This closes that gap: the generated page is written into your theme as a Shopify section whose every block has its own settings in the theme editor.