<input class="form-control" ng-model="chain[1][0]" crm-ui-select="{data: entities, allowClear: true, placeholder: 'None'}" />
<select class="form-control api4-chain-action" ng-model="chain[1][1]" ng-options="a for a in actions" ></select>
<input class="form-control api4-chain-params" ng-model="chain[1][2]" placeholder="{{:: ts('Params') }}" />
<input class="form-control api4-chain-index" ng-model="chain[1][3]" placeholder="{{:: ts('Index') }}" />
