I have a simple component using Lightning Data Service to set the value of a field.  I would like to pass the name of the field to update in as a parameter instead of hardcoding it.  What changes should I make to my component to do this?

<aura:component implements="flexipage:availableForAllPageTypes,force:lightningQuickActionWithoutHeader,force:hasRecordId" access="global" >

    <aura:attribute name="record" type="Object" />
    <aura:attribute name="simpleRecord" type="Object" />
    <aura:attribute name="recordError" type="String" />
    <force:recordData aura:id="recordEditor"
                      layoutType="FULL"
                      recordId="{!v.recordId}"
                      targetError="{!v.recordError}"
                      targetRecord="{!v.record}"
                      targetFields="{!v.simpleRecord}"
                      mode="EDIT" />
    
    <!-- Display LDS errors if any -->
    <aura:if isTrue="{!not(empty(v.recordError))}">
    	<div class="recordError">
        	<ui:message title="Error" severity="error" closable="true">
            	{!v.recordError}
            </ui:message>
        </div>
    </aura:if>

    <!--    Custom Interface Goes Here -->
    <lightning:button class="slds-button_neutral" label="New OSP Project" onclick="{!c.handleSaveRecord}" />

</aura:component>

({
	handleSaveRecord : function(component, event, helper) {

         //     Field Updates go Here
		component.set("v.simpleRecord.Trigger_OSP__c", true);    // THIS IS WHERE I WANT TO UPDATE A FIELD BASED ON A FIELD NAME PASSED IN AS A PARAMATER TO THE COMPONENT //
        
         //Standard way to save a record template using Lightning Data Service
        component.find("recordEditor").saveRecord($A.getCallback(function(saveResult){
            if(saveResult.state === "SUCCESS" || saveResult.state === "DRAFT"){
                console.log("Save completed successfully.");
                $A.get("e.force:closeQuickAction").fire();
            }else if(saveResult.state === "INCOMPLETE"){
                console.log("User is offline, device doesn't support drafts.");
            }else if(saveResult.state === "ERROR"){
                console.log("Problem saving record, error: " + JSON.stringify(saveResult.error));
            }else{
                console.log("Unknown problem, state: " + saveResult.state + ", error: " + JSON.stringify(saveResult.error));
            }
        }));
	},
    
    cancel : function(component, event, helper){
        $A.get("e.force:closeQuickAction").fire();
    }
})