[keycloak-user] How to add Custom static HTML files to Keycloak server unlike Theme templates (.ftl)?

Hello Keycloakers, I have gone through the documentation of customizing themes in Keycloak and it is very well documented. But as of my use case I want to customize or rather add a new HTML file to '/themes/base/admin/resources/partials/' directory. I don't know what would be the procedure of doing so and would request for any documentation list or so. Thanking You!!!! Kind Regards, Haseb