​@abdelmalek.mecheri Yes, it’s possible. The Pool Tasks page is built on the JtTask entity, so you can use Page Designer to configure the visible fields and also add Custom Attributes to the page.

The general capabilities of Page Designer are documented here:
https://docs.ifs.com/techdocs/24r2/040_tailoring/225_configuration/200_client_configurations/

Since this is a mobile page, you would have to start from Solution Manager’s Apps for Page Designer page, as documented here:
https://docs.ifs.com/techdocs/24r2/030_administration/040_native_apps/020_configuration/048_apps_for_page_designer/

​@Alexander Heinze’s MWO Service Demystified also has a section on configuration, and is an excellent read if you’re new to this area. See more here: 

Best regards,

Rukmal

As Rukmal already mentioned, MWO Demystified has an example walk-through for creating a custom field and adding it to MWO. Finding the page is a little tricky. Make sure you login as the MWO user (not the admin) to make sure you see data. Navigate to Solution Manager>Mobile Apps>Configuration>Apps for Page Designer>Service Engineer>Pool Work, open Page Designer and in the left-hand panel open ALL ELEMENTS>Cards>Pool Tasks Card. This is where you add your custom field (after you created it).