Using <h2> tag to style emails

I have a button to send an email update to clients regarding their account. I want to stle the first line with the <h2> tag but when I try to style my table reference to the property in question, it prints the reference in the <h2> style rather than displaying the actual record in <h2>. Does anyone know how I can retain the format with the email pulling the correct information.

My code is as follows:

sendEmail({
from: userEmail(),
to: 'Linked Property'.'Buyer Email',
subject: "Notification" + " " + 'Linked Property'.Property + " - " + 'Linked Property'.'Buyer Name',
text: "Notification for " + 'Linked Property'.'Buyer Name',
html: "<h2>There has been an update to your purchase profile for 'Linked Property'.Property</h2>" + "<br>" + "<br>" + "The following note has been added regarding the purchase of the above property:" ...

I know I have included it within the " " but I can't figure out how to stlye it with the <h2> tag without turning it into a script

Any advice would be greatly appreciated!