Hi Muqaffi,
Greetings from Syncfusion.
Query 1: I trying to create different symbols
We can achieve your requirement of adding a different
symbol by using the Content property in Annotation. However, we
have created a simple MVC application to demonstrate the same and it can be
downloaded from the below link.
Sample link: https://www.syncfusion.com/downloads/support/directtrac/general/ze/ChartSample826186285
Screenshot:

Query 2: <p> tag does not work
We do not have support for the <p> tag in the Chart
component.
Kindly, revert us if you have any concerns.
Regards,
Swetha