[ksec]

You need to speak to someone / your manager that you can trust.

Sometimes simply asking this question is a red flag because you are suppose to develop for the company. They could give you three months time and have your current workload to somebody else while you deliver.

The thing to ask isn't how you can sell a frontend to your own company. It is how you could use this knowledge to show your skills and get a promotion, bonus, network or whatever you want to your advantage. That is why talking to your manager is important, assuming you trust your manager.