How can I use the component generated language variables into JDOM output?

In JDom, you can call getExtension() to return the current component alias 'com_xxxx'.

With that, you can reconstruct a language var.

Second possibility is to send them in parameters of the control that need it (declare them in __construct)
(see example in html.form.input.select)

Thanks, admin you pointed me to the right direction.
for anyone who may need it, this is how I did:

added the following code in PHP file of the jdom item:
$language = JFactory::getLanguage();
$language->load('com_XXXX');


then you can just use the variable. for example:

$strYES = "COMXXXX_FIELD_ONLINE";
$strNO = "COMXXXX_FIELD_OFFLINE";

for reference:
docs.joomla.org/Specification_of_language_files