Not sure if you can do that with the JIRA Multi Line Custom field natively.
<div id="field-customfield_xxxx" class="twixi-block collapsed">
I've checked, the HTML code is correct. But it is ignored for some reasons. If I expand field at any issue, it expands in other issues too, as well as in the just created issues (class="twixi-block expanded). If I collapse field, same things happens everywhere (class="twixi-block collapsed).
Yes I was able to make this work on Jira 7.5 server. Use the below html code in the custom field description. Replace the custom field Id to the correct one.
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