I am doing some encodind in Python like this:

def get_encoding(tag, field):
    company_name_byte_array = field.encode('UTF-8')
    company_name_tag_encoding = tag.to_bytes(length=1, byteorder='big')
    company_name_length_encoding = len(company_name_byte_array).to_bytes(length=1, byteorder='big')
    return company_name_byte_array, company_name_tag_encoding, company_name_length_encoding

Now the issue is I want same encoding in JavaScript, So I am confused how to do this? What will be the equivalent JavaScript code for this. I did successfully in Python.