Is it possible to check with Twig the role the current user has?

Is it possible to check with Twig the Group role the current user has, to use it as in the following code?

{% if is_member == true %}
  {# … #}
{% endif %}

I tried with $group_memberships = \Drupal::service('group.membership_loader').loadByUser($account); in the .theme file, but it doesn't work.

to see the list of user roles try the following:

{% set roles = user.getroles() %}
{{ dump(roles) }}

if you want an specific role try

If you want to do anything only for the particular role then do this:

{% if 'ROLE_MACHINE_NAME' in user.getroles()  %}
  // do your stuffs here
{% endif %}