You want learning everywhere. Informal and formal. Your job is to encourage and support that, but probably not control it. Your job is to establish the framework, offer support and encouragement but not prohibit, ignore or over-regulate. Give permission for learning to occur across the whole workplace.
Draw attention to what works. Give endorsement to those who share their knowledge willingly, recognise and emulate good practice. This will draw attention to the impact of learning. You are about impact and not process.