You can't except if you use nested lists and the "each" filter.
Example you can try on tiddlywiki.com:
<$list filter="[all[shadows]has[group]sort[group]each[group]]">
<$view field="group"/><br/>
<$list filter="[all[shadows]field:group{!!group}sort[title]]">
---<$view field="title"/><br/>
</$list>
</$list>
It lists all shadow tiddlers having a group field and sort by this field.
In each "group" it sorts by title
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