public List<Vote> votes { get; set; }  (inside Post model)

public class Vote
{
    public int accountId { get; set; }
    public bool body { get; set; }
}

int likes = 0;
foreach(Vote value in post.votes){
    if(value.body == true)
          likes++;
    else
          likes--;
}

var posts = await mapper.ProjectTo<PostDtoRead_1>(db.Posts.Where(p => 
    p.IsPublished == true &&
    p.DeletedStatus!.Body == "Default")).ToListAsync();

public class PostDtoRead_1
{
    public int Id { get; set; }
    public string Title { get; set; } = null!;
    public string PostDescription { get; set; } = null!;
    public DateTime PublishDate { get; set; }
    public DateTime UpdateDate { get; set; }
    public string? CoverImage { get; set; }

    public AccountDtoRead_1? Account { get; set; }
    public DeletedStatusDto? DeletedStatus { get; set; }
    public LanguageDto? Language { get; set; }
    public PostStatusDto? PostStatus { get; set; }
    public PostTypeDto? PostType { get; set; }
    public RatedAsDto? RatedAs { get; set; }
    //-----------
    public ICollection<ChapterDtoRead_1>? Chapters { get; set; }
    public ICollection<CommentDtoRead_1>? Comments { get; set; }
    //-----------
    public ICollection<PostGiftDto>? PostGifts { get; set; }
    public ICollection<RateDto>? Rates { get; set; }
    public ICollection<VoteDto>? Votes { get; set; }
    public ICollection<TagDto>? Tags { get; set; }
    public ICollection<ExistingStoryDto>? ExistingStories { get; set; }

    public int Karma { get; set; }
    
    public PostDtoRead_1(ICollection<VoteDto>? Votes)
    {
        this.Karma = Votes.Count(l => l.Body == true) - Votes.Count(d => d.Body == false);
    }
}