Having static and dymanic content in textarea "value"

Hi Guys,

I’ve got a textarea and I’m wanting it to display a preview of an email

eg.

Hi {{customersnamefromdb}},

here’s some email content

Thank you

I’ve got it all stuck in the “value” and it’s displaying correctly except it’s not grabbing the dynamic data - is there a way I can make it actually run the dynamic data rather than just thinking it’s just plain text?

Hope that makes sense - feel like it doesn’t so if it needs clarifying please let me know,

Any suggestions/guidance would be very much appreciated.

Thanks,
Ben