Please tell me how to set the SPF record in gmail.

I'm trying to use Python to send a marked up email for gmail from the gmail server via SMTP.
Event Reservation|Email Markup|Google Developers

However, when I embedded the above sample code in the html email and sent it from my own gmail address to my own email address, the result of markup was not displayed.
So, after a lot of research, I found a similar question on stack overflow.
Google email markup not showing-Stack Overflow

In answer to the above question,

v=spf1 include:_spf.google.com~all

It says to use as a SPF record, but
If you want to send mail via SMPT from the gmail server,
How should I set this SPF record?
Please let me know.