Well-said, Rosemary.
I know several people on the site have also expressed that they believe they shouldn't reveal when they are doing something for someone else in accordance with Matthew 6:3, because they have said that announcing a good deed in public will cause one to lose their heavenly reward.
I have to admit to wanting also wanting emoji in the past, but am now on the fence because I find myself agreeing with both points of view.
Avisanct, I don't know if this will help, but since we don't have a prayer emoji, when I read a prayer request or even just a post I find myself praying over, I tend to use the heart emoji to at least let the person know that someone read what they shared and is thinking of them.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
If you are able to PM, you might want to send them a message as well.
God bless and welcome to CC.