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The rather obscure semi. company E-Peas has been making similar harvesting chips for a while:

https://e-peas.com/product/aem13920-dual-source-energy-harve...

The Nexperia chips are also worth looking at, in that they translate high impedance sources to low enough to charge a cap:

https://www.nexperia.com/products/analog-logic-ics/power-ics...

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Just to get a raw idea, can this accumulate enough power to gather a gps position and send it over wifi / 4g nb-iot signal ? I have only very basic knowledge so not enough to make an estimation of the kind of things this can power

While possible it is unlikely. It would take a considerable amount of time to accumulate that amount of energy needed from these sources. These systems are generally used for transmitters that transmit for a couple of seconds at most and may be off for the rest of the day. Enough energy would have to be accumulated to run the GPS long enough to get a valid fix etc.

Thanks so the ballpark estimation of how "intensive" it can be is 1 or 2 measure a day from a local sensor and transmission over 4g ?

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