There isn't really an equivalent to something like SOQL's IN in Flows. As an alternative, you could add a formula field on User to pull Profile Name in and then filter on that in the Get Node for Users.
What you can do is, when you are retriving the data in handleSync you can add the data into two attributes. For example:
this.dataList = finalData;
this.databackupList = finalData; //to save the backup of data you are retriving using handleSync function
and then you can filter using this.databackupList. For example:
this.dataList = this.databackupList....