That requires some scripting, see this post
As alternative you can create XSD from your excel and create a domein model from the schema.
You could do that from Mendix
XSD structure
<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Something" nillable="true" type="Something" />
<xs:complexType name="Something">
<xs:sequence>
<xs:element minOccurs="1" maxOccurs="1" name="ID" type="xs:int" />
<xs:element minOccurs="0" maxOccurs="1" name="First_Name" type="xs:string" />
<xs:element minOccurs="0" maxOccurs="1" name="Last_Name" type="xs:string" />
<xs:element minOccurs="0" maxOccurs="1" name="Phone_number" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:schema>
But is it worth the effort? That is up to you.
0. Create a web service which expose the required data in your Mendix app. Create also a microflow which is started when the button is clicked and it makes a request to the nodejs server in step 1 , for example GET.
1.Create a nodejs simple server which execute command on command line "node yourfilename.js" when a request arrive (You will hardcode the command "node yourfilename.js" inside the code for the server so it do only this action when receive a request for security reasons). Place this file inside your mendix sdk folder so the path "yourfilename.js" works, otherwise you must specify the full path.
2. inside your mendix sdk file create a request to your Mendix app service that you've created in step 0 using some library like "request".
3. Start the server from the command line like "node myserver.js"
Go to your app, click your button and that's it, your file will be executed and create/update app.