Wanting to have one Vo2 session once a week when using training plans

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@chacho

As an older cyclist it’s a good idea to have at least one Vo2 session a week for longevity.
How do I incorporate this when using create my custom plan?

I don’t think this is a good idea, even if you want to maximize longevity. The structure of training plans is not accidental, there is a reason why the base and certain speciality phases do not have (much) VO2max work.

To meaningfully increase your VO2max, you need to work on your base first so that it can support growth of your VO2max. And you need to change the stimulus, doing VO2max all the time would lead to plateauing.