Conditional Include in LINQ c# .Net (Dot Net)

It may not be the best way. If you know better and not much complicated way of achieving the same then please comment.

The below LINQ query is for a table schema in which a Project can have section and both project and section can have test cases (But Unique). So, I need to fetch the project detail including section and its test cases and project test cases (test cases which are not part of any section but are part of a project).

var projectQueryable = await _projectRepository.GetAsync(proj => proj.Id == projectId); // get the queryable variable for project
var project = projectQueryable
 .Include(proj => proj.Section)
 .ThenInclude(section => section.TestCase)
 .Include(proj => proj.TestCase)
 .FirstOrDefault(); // fetch all the required data in memory

project.TestCase = project.TestCase
 .Where(test => test.SectionId == null)
 .ToList(); // filter the data