You test your requirements from usability spec and SRS in your software test plan. Doing that way, you verify both your SRS requirements and usability requirements during tests phases.
Take care when using the term "usability requirements". You do not verify usability requirements (which are the requirements related to a specification or intended use) with verification tests. Verification test only evaluate design requirements, meaning, the requirements for the user interface design in this case (as noted in the standard - The USER INTERFACE is subject to VERIFICATION to the USABILITY SPECIFICATION. The USABILITY SPECIFICATION is subject to VALIDATION, where the USABILITY VALIDATION plan incorporates the acceptance criteria).
The usability validation plan is a document with a broader view. It contains references to your qms procedures and to documents of your project, to show that you pass all the requirements of the 62366 standard.
Sorry, but where did this information come from? The usability validation plan does not evaluate that you pass all requirements of the standard (note that meeting the standard in principle does not means that validation is achieved). Validation verifies the device usability validation, which is related to the intended use of the device.
It does not need references to the QMS nor to project documentation. The usability validation plan only needs what is required by 5.6. For more info on this, please see 4.7.3.
With this in mind, please note that you example validation plan on your attached file is wrong.
A basic template usability validation plan per IEC 62366 would need at least the following information:
1 - Method(s) used for validation of the primary operating functions (which includes, for example, if the methods are quantitative or qualitative, which types of conditions are used - actual or simulated, what is the method process used, who is gonna be tested, remembering that it must be representative of the intended user population)
2 - Risk acceptability criteria per ISO 14971 (validation criteria)
3 - Frequent and reasonably foreseeable user scenarios (form the usability specification