Access iron-meta instance from a Mixin - polymer

Question

Polymer 3 and iron-meta. How do I access meta from the <iron-meta></iron-meta> instance? I could do document.createElement in my mixin, but it's cleaner with just one <iron-meta></iron-meta> element to work off of.
Mixin:
let rawApiConstantsMixin = (base) => {
class foo extends base {
constructor() {
super();
}
ready() {
super.ready();
this.FORM_HOST = meta.byKey('FORM_HOST');
}
}
return foo;
};
export const ApiConstantsMixin = dedupingMixin(rawApiConstantsMixin);
class MyView2 extends ApiConstantsMixin(PolymerElement) {
static get template() {
return html`
<style include="shared-styles">
:host {
display: block;
padding: 10px;
}
</style>
<iron-meta></iron-meta>
<div class="card">
<div class="circle">2</div>
<h1>View Two</h1>
<p>Ea duis bonorum nec, falli paulo aliquid ei eum.</p>
<p>Id nam odio natum malorum, tibique copiosae expetenda mel ea.Detracto suavitate repudiandae no eum. Id adhuc minim soluta nam.Id nam odio natum malorum, tibique copiosae expetenda mel ea.</p>
</div>
`;
}
}
window.customElements.define('my-view2', MyView2);

Answer 1

Actually, I ended up not using iron-meta. Since Polymer 3 uses ES6 modules, I just made my own module with the api constants and injected it into the components that need it.

Answer 2

Have you tried to access
window["meta"]
and checked whats in there? maybe you can access is by
window["meta"]["FORM_HOST"]