eg-0203

{
  "@context": "https://schema.org",
  "@type": "Organization",
  "name": "Cryptography Users",
  "member": {
    "@type": "OrganizationRole",
    "member": {
    "@type": "Person",
    "name": "Alice"
    },
    "startDate": "1977"
  }
}

<div vocab="https://schema.org/" typeof="Organization">
  <span property="name">Cryptography Users</span>
  <div property="member" typeof="OrganizationRole">
    <div property="member" typeof="Person">
      <span property="name">Alice</span>
    </div>
    <span property="startDate">1977</span>
  </div>
</div>

<div itemscope itemtype="https://schema.org/Organization">
  <span itemprop="name">Cryptography Users</span>
  <div itemprop="member" itemscope
        itemtype="https://schema.org/OrganizationRole">
    <div itemprop="member" itemscope
            itemtype="https://schema.org/Person">
      <span itemprop="name">Alice</span>
    </div>
    <span itemprop="startDate">1977</span>
  </div>
</div>

A basic Role example in JSON that
shows how to qualify the 'member' property
by adding an intermediate Role entity.