How to call default API endpoint in custom plugin?

I will write again the use case.

I have created one custom Strapi route/api (not inside the plugin) but in Strapi itself

src/api/data

the src/api/data/routes/data.ts

export default {
    routes: [
        {
            method: 'GET',
            path: '/data',
            handler: 'data.get',
            config: {
                policies: [],
                middlewares: [],
            },
        },
    ],
};

src/api/data/controllers/data.ts

export default {
    get: async (ctx, next) => {
        try {
            ctx.body = 'ok';
        } catch (err) {
            ctx.body = err;
        }
    },
};

In the frontend I have created a plugin that makes the calls like

const { get } = getFetchClient();
 const response = await get('/api/data');

I also used request as you suggested

In both cases I get 401 response code and get logged-out from Strapi admin panel