Opening content script only if an element is present on the page?

I want to show my extension in a sidebar only if a certain value is present in the html of the page. Im looking to show the extension content sidebar only if the json+ld schema matches @article.

I have a scraper function that returns content if it exists (which I already have working perfectly) but lets just pretend for this question that it simply returns a boolean.

for example could this:
export const config: PlasmoCSConfig = {
matches: ["https://www.medium.com/*"],
// could be 10000000 more
// if I can match by schema type I may only need 1 line of code
};

be accomplished somehow with something like this:
const checkIfItsTheContentIWant = (scrapedHTMLFromPage) => {
// for berevity
return true;
}

export const config: PlasmoCSConfig = {
matches: checkIfItsTheContentIWant();
}

Or failing that can I pass in a array of sites

like
matches: [...sources]
?
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