Increase capital in a SAT

Can the value of the partners' bare ownership be included to increase the capital of a SAT (Tax Administration Service)?
Agricultural Transformation Societies (SATs) are not and do not function like capital companies (SLs or SAs). They have their own legislation (Royal Decree 1776/1981) and, subsidiarily, the Civil Code. The question is: could the share capital of the SAT be increased by adding the value of the bare ownership of one or more partners? And if all the partners are family, could the bare ownership belong to all of them? In this case, would it be possible? And if they are not all family or siblings, that is, if there are other partners who have no connection to that bare ownership...