Thanks for help I will put a issue on hold for for some time 
I tried to create  new ssis that use mysql as data source and pass connection string...

When "Edit it" inside package
I see that is listed as .\Net providers\MySQL Data provider

In properties of connection
Connection manager type = ADO.NET:MySql.Data.MySqlClient.MySqlConnection, MySql.Data, Version=6.9.8.0, Culture=neutral,...

Thank for the tip!
I did not no that  that additional parameters overwrite ..values

Managed to connect as 
On login tab
Server name =CANSQLSERVER1\SQL2V2017
login = 'myUser1'
password ='****'

I tried installation with
/RSINSTALLMODE=FilesOnlyMode
yes SSRS installed and no ReportServer databases created

I would probably will use this option and create PowerShell script that will run...

>Can you run a SQL script to rename the database post install? Is that an option for your method or no?                                  
if ReportServer db is renamed after install...

installing as new instance of sql2008R2
server already has 2 more named instances (2008R2 and SQL2014)
we automating installation of SQL  in our shop (similar to azure and amazon), "click...

Might be I am not clear

let say I created  Data source as following

Data source name: Dummy1

Connection string: myserver,1499;inicial catalog =mydb1;uid=mydomain\ssrs_report_user1

Credentials stored securely in the report...

Thank a lot .
Provided solution is working fine

Thanks Jeff,
PowerShell replacement of sql based stored procedures is part our project
bellow is solution I used (part of the code)

  #call to unix script
     $UnixOutput = (Run-Cmd -command "listdbpriv...

1.SQL 2014