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I use intervals.icu to chart fitness, TSS, freshness etc. With enough data it does a very accurate job of estimating TSS from heart rate in outdoor rides with no power meter. I’ve also been swimming this week while on holiday, want to have a vague idea of TSS from that to see how it affects my recovery week - so far so good on that front too. Grabs all its data from strava so I’ve been manually adding swims.
Don't really have any particular event lined up, but I was keen to have an idea of it to tune down the training to come and bring back the average TSS to what it was before which I found rather sustainable