The SBL Handbook of Style, 1st ed., suggests several abbreviations that involve small capital letters (e.g., §8.2). Zotero’s rich text markup will support the use of small capitals in a citation’s prefix or suffix fields. Zotero will turn text into small capitals if the text is enclosed by:
<span style=”font-variant:small-caps;”> and </span>
Or, apparently also the simpler:
<sc> and </sc>
In the SBL Handbook of Style, 2nd ed., the use of small caps looks to be restricted to Sumerian logograms (§5.5).