PowerApp Form- Multi-Line Text field with versioning and append changes to existing text

I have another form that has the same settings(  Multi-Line Text field with versioning and append changes to existing text) but is using the standard Sharepoint form and it logs every comment with the username and date/time stamp of the comment.

I would like to have this happen in the powerapp form but it doesn't seem to carry over the parent settings into the text field.

How can I add username and timedate stamp for any entry made to that Notes/text column?

Thank you for any advice/help with this.

Ren

Update - 

Okay, I figured out how to add the username and date to the text field and on change of the text field. My issue now is how do I get the Username and Date to not overwrite the existing text entered on creation?
I added this formula to the OnSelect and OnChange of the Text Column, works great except for the OnChange issue. Again how can I just append the Name/date/time to the existing text?

Multiple users enter data and we need to track who entered the comment and the date and time.

Thanks in advance