After some digging, I came up with this solution. If anyone has any other suggestions please advise.
Code:
/**
* Determine if the field is in a select modal list
*
* @return {boolean}
*/
isListSelectMode: function() {
if(!this.isListMode()) { return false; }
let p = this.getParentView();
if(!p) { return false; }
//grandparent
let gp = p.getParentView();
if(!gp || !gp.hasOwnProperty('selectable')) { return false; }
return gp.selectable;
}

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