There is a passage in the Scrum guide that might work in your favor:
The Product Owner is the sole person responsible for managing the Product Backlog. Product Backlog management includes:
Clearly expressing Product Backlog items;
Prior experience as a PO is not necessary to pass. If you do it when you have experience it will be easier. Plus probably you will retain more knowledge over time.
If you want to use it to land a job as a PO, to show motivation and knowledge, I would go right ahead! If you start as a PO…