Flows metadata that Bypass User Permissions (SFDX)

In Summer 20, we have a possibility of define a "Run mode" of a Visual Flow, to run avoiding user permission, as we can see on this link: Run Flows That Bypass User Permissions.

But when you create a flow, with "System Context Without Sharing-Access All Data" option on "How to run flow" field and pulled it from Scratch org to your local branch, you receive a flow metadata (xml) without any reference to this "Run mode". In related link (Tooling API New and Changed Objects
), they refer to a runInMode field and SystemModeWithoutSharing (enum) option to set you flow without user permission… but it isn’t on metadata. Look at this flow metadata example:

<?xml version="1.0" encoding="UTF-8"?>
<Flow xmlns="http://soap.sforce.com/2006/04/metadata">
    <interviewLabel>test {!$Flow.CurrentDateTime}</interviewLabel>
    <label>test</label>
    <processMetadataValues>
        <name>BuilderType</name>
        <value>
            <stringValue>LightningFlowBuilder</stringValue>
        </value>
    </processMetadataValues>
    <processMetadataValues>
        <name>OriginBuilderType</name>
        <value>
            <stringValue>LightningFlowBuilder</stringValue>
        </value>
    </processMetadataValues>
    <processType>Flow</processType>
    <screens>
        <name>test</name>
        <label>test</label>
        <locationX>430</locationX>
        <locationY>70</locationY>
        <allowBack>true</allowBack>
        <allowFinish>true</allowFinish>
        <allowPause>true</allowPause>
        <showFooter>true</showFooter>
        <showHeader>true</showHeader>
    </screens>
    <start>
        <locationX>50</locationX>
        <locationY>50</locationY>
        <connector>
            <targetReference>test</targetReference>
        </connector>
    </start>
    <status>Active</status>
</Flow>

Any ideas how to add this "RunInMode" and "SystemModeWithoutSharing" on flow metadata?