Unable to share sensor with Alexa

I’ve got a couple of template sensors which are working well and are visible with home assistant. However, they are not appearing as entities than can be exposed to Alexa. Everything else is showing in the entities list when managing Alexa.

I need to build an Alexa routine based on the sensor but it seems I’ll have to map it to an input boolean in order to share it.

Are template sensors shareable with Alexa?