There will need expert knowledge to remove the functionality that is stripping out tags and enable HTML code editor. This is because, it’s not too simple as you are thinking, also not too easy to do.
In this issue, you need to hire someone WordPress Expert to customize the theme code based on your needs.
Moreover, please learn more our support policy (item support includes & not includes), here https://www.themelooks.com/support/support-policy/ before post a topic or ask for support.
Best Regards,
ThemeLooks Support Team