PDFExport does not pass special characters to pdf using shadow DOM

Hello.

I am trying to use export to PDF. Unfortunately, the resulting pdf contains incorrect characters. I know, I saw the posts:

PDFExport .save does not pass special characters to pdf in KendoReact | Telerik Forums

React Drawing Component & Unicode and Embedded Fonts - KendoReact Docs & Demos (telerik.com)

But. I tried it and it works correctly. But if I used shadow DOM (I need this approach), then the pdf is incorrect. I tried adding styles via the approach:

document.createElement('style');

style.innerHTML = styles;

shadowRoot.appendChild(style).

But it doesn't work.