I think it would be better if you could get a recommendation letter from a well-known leader in product-led digital technology who knows your work. It is not necessary if you have not worked with them directly. You can use your former head unit as a reference in the 10 pieces of evidence you will be submitting.
@Edg I think you can get a letter from your ex-manager if he is a leader in the digital space, in my application, one of my recommenders was the CTO of my previous product-led job. Although, my application came back rejected, however, no mention of my recommendation letters as the issue. Don’t know if this helps.