Well… found the way to do it, however it’s undocumented.
You should create a file /plugins/{plugin-name}/config/bootstrap.js. This action is executed by - as I understand it - by actionProvider.register. Here is an example of code, which works for me.
module.exports = async () => {
// set plugin store
registerPermissionActions();
};
const registerPermissionActions = () => {
const actions = [
{
section: 'plugins',
displayName: '<display name of the plugin>',
uid: 'read',
pluginName: '<here goes the name of your plugin>',
}
];
const { actionProvider } = strapi.admin.services.permission;
actionProvider.register(actions);