Hi, @Bhoomesh Joshi ,
First for footer, it is an out-of-the-box feature for Communication site only. We do not have same feature for team sites. If you want footers on a team site, you will need to deploy custom SPFx solutions for customizing.
Reference for you: https://github.com/siddharth-vaghasia/SPFxWPConfigurableHeaderFooter
And for header, I assume you are mentioning the top navigation in the communication site.
For this feature, MS does not have plan to support it in a team site. It is recommended to use hub site to have a consistent shared navigation experience across multiple team and communication sites. The hub navigation supports both the megamenu and cascade layouts. Information on hub sites: https://support.office.com/en-us/article/what-is-a-sharepoint-hub-site-fe26ae84-14b7-45b6-a6d1-948b3966427f
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