How can I handle embedded internal style sheets in Excel files?

I received a request to translate a bit of software. The UI strings have been exported to an Excel file, which is apparently also the format in which I would have to deliver the software. The UI strings of course contain placeholders and HTML tags, the latter especially in all sorts of messages and notifications that are sent out by the system to the users and admins. Thanks to Paul Filkin's very helpful post on handling taggy Excel files, I've managed to get a lot of those out of the way. One major thing I'm stuck with, however, are the internal css style sheets.

The opening and end tags themselves are converted nicely, but of course there's a lot between those that I don't need to bother with at all. Take for instance this:

<style type="text/css">.content td {{font-family:Arial, Helvetica, sans-serif; font-size:10pt; background-color:white; padding-left:2em; padding-bottom:1em}} em {{font-size:8pt; color:#999}} </style>

 As mentioned, the "style type="text/css" tag pair is recognised. Is there a way of making Studio place everything inbetween in a tag or placeholder as well?

I hope this is clear enough; if you need more information, please let me know.

Best regards,

Matthijs Frankena