Atomic update Permission's policy

Getting advice
1

Hi. I’m using Keycloak NodeJS admin client (@keycloak/keycloak-admin-client)

To update policies of a permission, I use updatePermission:

await this.keycloakAdminClient.clients.updatePermission(
    {
        id: resourceServer.id,
        permissionId: exist.id,
        type: permission.type,
    },
    { policies: ["id1", "id2"] },
);

The problem is, when I want to add a new policy to this permission, I have to fetch all it’s current policies first, then add new policy id to this list, before adding the whole list to update payload. Something like this:

const permission =
    await this.keycloakAdminClient.clients.findOnePermission({
        id: resourceServer.id,
        permissionId: exist.id,
        type,
    });

// Get current policies of permission
const policies = permission.policies;
// Add new policy
policies.push(newId);

await this.keycloakAdminClient.clients.updatePermission(
    {
        id: resourceServer.id,
        permissionId: exist.id,
        type: permission.type,
    },
    // update the whole current policies
    { policies },
);

I think this is not optimize in term of memory, for example when there is hundreds or thousands policies attached into a permission. And it is not an atomic update.

Is there a function/api which only add a policy to or delete a policy from a permission?