Hi Tracey et al.
Alright - here's my attempt at a response. I know that you know most or all of these things, Tracey, but I'll try to explain them at the same time for others who might not be up to date. Also, TLDR, I don't know the answer you're looking for. :(
It's pretty clear you mean Search Engine Optimization (not Search Optimization Engines), but tell me if you meant something different.
When one publishes Linked Data, different actors, like search engines, will consume it and they will often handle it differently than regular (non Linked Data) content. An example of how content can be treated differently is the knowledge panels that turn up in Google if you search for certain popular topics that have Wikipedia pages. Another example of how an actor would treat it differently is that Alexa uses Linked Data to be able to answer questions.
So, either you're A) asking if people with Canadian web sites are taking advantage of this new Covid Linked Data schema by publishing their content to that schema, knowing that search engines will consume this special content. Or you're asking B) specifically if there is awareness of this opportunity in the SEO community in Canada, and if they are helping their clients take advantage of this new schema.
To find out the first, because this is Linked Data, you could probably find the limited number of people who are publishing this Linked Data and then Google stalk them to find out who they are and if they are based here in Canada. ( I would have to check out how to do this, because I'm not the technical person in my company, but I can imagine a couple ways of doing it).
To find out the second, you would have to go to places where SEO experts hang out and then ask them. I found a small group of Canadian SEO experts on LinkedIn, but you could probably find something better with a little more time.
My company is super excited about the prospect of helping organizations publish Linked Data for exactly these purposes. Here's two examples we find inspiring - both done by the NHS.
Hopefully that's useful. Also, to be clear, this is one of the ways that open data can actually be useful. Cuz you don't have to go collect it from some open data portal.
Cheers,
Mike