How can I run Java Classes without any feature files to get serenity reports?

[samruddhidhoble]

Hi,
We have an existing project which has 100+ Script automated for Rest API testing using Rest Assured/Java framework. We saw serenity reports samples and found interesting and wanted to implement it in our project.
We tried maven setup,but we could get report for our scripts only running as maven test.
Since our project never had any feature file to run ,we always ran as junit.

Can you please suggest how can I run my existing java classes as junit, by implementing any runner class with out any feature file to get serenity reports.
I tried to use @WithTag name, @with tag color but it didn't work.