Dropdown autoselect based on a condition

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Javascript

Hi, I'm using a Chrome autofill extension. From this saved static page:

https://spazioweb.w3spaces.com/reference.html

I would like would be autoselected:

"INTERNA" in "Circolazione" field, if

user writes "REF." in "Sezione".

This should be the "Circolazione" code block, thanks!

<option value="D">DISTRIBUTORE</option>
<option selected="" value="I">INTERNA</option>
<option value="L">LIBERA</option>
<option value="N">NO</option>
<option value="O">Disponibile online</option>
<option value="Y">Escluso ILL/ISS a tempo</option>
<option value="Z">Escluso ILL/ISS definitivo</option>
</select>">

What I have tried:

mySelect.value = input.value === "SIREF." ? "I" : "none";