If your PM team only has one or two people responsible for covering multiple products with complex features, I would recommend building a prioritized list of deliverables that are necessary to achieve your objectives. Make sure the list is as small as possible and is the one that would move the needle the most. Once you have a list of the most important items to focus on, divvy it up among the team of 1-2 product managers and define exactly what needs to get done. This ruthless prioritization and focus on must-haves will help ensure that the most critical work is completed, even with a small team.
Additionally, you can seek to offload some tasks to other team members in the adjacent team so that it can free up PM bandwidth. For example, if there is an opportunity, EMs could create Jira epics and stories based on PRDs created by the product manager. Product marketing can help out with discovery and customer success can help a bit more with customer validation. In short, don't be afraid to find opportunities to creatively off-load in short term some PM tasks onto other teams. In addition, look for opportunities to introduce tools and processes to help manage and organize the work. For example, prefer asynchronous communications over synchronous meetings whenever possible to drive productivity and efficiency.
To support the long-term growth and expansion of the team, I would recommend identifying areas where additional support will be needed, such as specific products or features, and hiring additional PMs to support those areas. This will help to distribute the workload more evenly and allow the team to better support the growth and expansion of the products.
Overall, the key is to prioritize the most important work, automate manual tasks where possible, get help from other departments in short term to take on more responsibilities where possible for a short period of time, plan for additional head growth and hire incrementally.