Need Help to convert html text to Normal text

Hi Team, 
I am trying to convert HTML text to Normal text , here is the Html code :
<h1 style="font-size:25px;"> Data and AI </h1>
<p style="font-size:15px;"> This shows the Data and AI related informationfor data and AI </p>.
For this i have followed the below mentioned steps .
Step1 : Created a table and inserted this html text in a cell .
Step2 : Created a new formula : html.table([header],{{"text",":root"}}).
Step3 : it converts into a text and in conditional formatting of a blank button I am adding that as a field value .
The issue what i am facing is the line indentation and font is not captured of this rich text , what I mean 
Data & AI should show as a header and rest in next line as a sub header .
Can anyone please help me in this.
Thanks & Regards
Shiv