I examined world-language-specific projects. As part of that search, I found the following…

Documented General PBL Common Features:

Grade levels
Primary question of inquiry (Challenging Problem/Question)
Learning goals (Key Knowledge, Understanding, and Success Skills)
Project summary (Sustained Inquiry, Reflection, and Critique & Revision)
Major products (Student Voice & Choice + Public Product)
Considerations

WL-specific Features:

Large majority, if not all in target language to grow proficiency in the target language, in addition to solving a problem/question
ACTFL Standards alignment (national world language standards)
Products are integrated performance assessments
Cross-curricular connections

Here is a copy of the Essential Project Design Elements Checklist for the "Welcome to Our School!/¡Bienvenidos a nuestra escuela!" project: https://docs.google.com/document/d/1sEt3QcZhTeWBJ_H7FSiRElBichw-tDi8in6L05o4rGg/edit

This particular project resonated with me because it is within my content area of world languages, applies to lower levels of Spanish (which naturally are much more challenging to design and implement PBL), and because it can make an instant impact on the students' school community. I did something very similar to this when I was in the brick-and-mortar classroom, so would love to take this same idea to adapt to the online environment.

If I designed this online in Canvas, some of the cool features that could be used for this include:

MasteryPaths for students to choose a theme for their video and/or provide differentiation
Collaborations for brainstorming and planning
Canvas Studio for content creation and sharing (of which could include automatic closed captioning)
Assignments and/or Discussions for sharing with the class
Rubrics for evaluating
the built-in Peer Review feature for students to critique prior to revision

We have a large Hispanic population in North Carolina, so this project would be very meaningful to incoming students, especially if they've never taken an online class. I believe that the school culture and climate would be especially conducive to this type of endeavor and could see them featuring the products on the actual school website.

In hunting for PBL in WL resources, I came across this one. I'm came across this post with some good info. and resources.