input: Write a python function to extract new miRNAs from a TSV report file and return them as a dictionary.
  assert extract_new_mirnas_from_report('sample_report.tsv') == {"miRNA1": "Value1", "miRNA2": "Value2"}
  assert extract_new_mirnas_from_report('another_report.tsv') == {"miRNA3": "Value3", "miRNA4": "Value4"}
output: def extract_new_mirnas_from_report(file_path):
      mirnas = {}
      with open(file_path, 'r') as file:
          for line in file:
              if line.startswith("New_miRNA"):
                  parts = line.strip().split('\t')
                  mirna_name = parts[1]
                  mirna_value = parts[2]
                  mirnas[mirna_name] = mirna_value
      return mirnas