A simple Find/Change (Text tab) should find them if you are looking for a specific fraction. On the GREP tab \d+\/\d+ should find any combination of digits separated by a slash.
Either one is going to find already formatted text as well as unformatted and some extraneous matches like dates if they exist, and I can't think of a way off the top of my head to change the formatting in one go.
You can limit the hits to just text to which Opentype Fractions has been applied to remove false positives like dates, but thast still won't make a formatting change automatically. To do that you need to work in two steps, find numerators and make them numerators, then find denominators and change them. The though that something would be incorrectly changed is still so scary to me that I would still run any query one hit at a time rather than clicking Change All.
Another option is to design a GREP style that will find numbers that appear both before and after a forward slash, and convert them to fractions automatically. This is an old post, but it still works the same way.
But you said above the missing fractions are single glyphs...
And this is still subject to the risk of formatting dates as fractions (and if there is no word break included in the GREP possibly sending ID into a tizzy when it encounters a date like 2/19/2022) or formatting the interger part of a number like two and one half as part of the numerator.
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