Current problem
Currently, the only variant of Portuguese that is officially supported by Fluxer is the Brazilian one. In this context, there is a peculiarity in Fluxer's Weblate: the project for the Flutter client lists both "Portuguese" and "Portuguese (Brazil)", although the project for the rest of Fluxer only lists the latter. Assuming that, as is the case with Spanish, "Portuguese" means the European variant, this makes European Portuguese the only option listed for Flutter but not Fluxer.
While the inclusion on the Flutter project doesn't seem to have been intentional, I and others have been contributing suggestions to this variant regardless, in hopes of seeing them used in the future. This interest that was shown could be used to better catch the interest of some public at least in Portugal.
If anyone else reading this post is interested in contributing to an official European Portuguese translation, please comment below.
Proposed change
On Weblate, keep the European Portuguese entry in the Flutter client project, and add it to the general Fluxer project, so that a full translation can be made.