Email Generator for a Club

Using a User Input block (long text) the mail details of the presentation are entered. The model does a great job creating and formatting email.
I would like to add a constant six (6) lines footer to this email.
Is there a way to have that footer to be a part of the agent structure, so we do not need to enter it on every run or fetch it from a Google Doc?

Thank you in advance,

I found a way to get this done by including these footer lines into a system prompts.

If there is a better way of accomplishing this, please share.