Send Email vs Compose email

Your good self is right in pointing out the use of email component as well as composing email action is causing confusion. I corrected it.
But the problem of email component not picking up values from columns for Subject and Body stays.
I have tried button with compose email action, it does not fill column values either from Google sheet or from connected data editor table. I have tried Email component alone , but it also fails to pick up pre filled values from data editor table.
My understanding after lot of experimentation is that email component takes data reg Subject, Body only from

  1. Built in Custom 2.user specific Template column.
    If this is not correct, please cite a single instance with Google sheet/ data table with screen shot etc. where it picks data for subject and body from table column for my learning.
    Thanks
    Vk