Install one of three browser helpers and Szpargalka Sans takes over on every Polish page you visit, rendering inline pronunciation hints above the digraphs — shown here on the Polish Wikipedia article about the Polish language.
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One-click download of the pre-built extension zip. Recommended path — it has a popup with per-site toggles and bundles the font as a base64 data URI so it works offline.
Open chrome://extensions and enable Developer mode in the top-right corner.
Click Load unpacked and point it at the unzipped chrome-mv3 folder. The extension ships disabled — click the toolbar icon to flip the global toggle to On, or leave it Off and use per-site overrides only.