reporting-engine/sql_request_abstract/readme/USAGE.md

Inherit the model:

from odoo import models

class MyModel(models.model)
    _name = 'my.model'
    _inherit = ['sql.request.mixin']

    _sql_request_groups_relation = 'my_model_groups_rel'

    _sql_request_users_relation = 'my_model_users_rel'

See implementations in the modules bi_sql_editor and sql_export. (same OCA/reporting-engine repository)