I think Accubattery on playstore shows charge current. Im not sure where it gets the data from but it might be what youre looking for
this post was submitted on 18 Jun 2023
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Not an app, but a device that will monitor power usage, like a kill a watt, is really handy for this sort of thing. You can tell right away if it is in a low power charging mode.
As others have said, the actual problem is probably a dirty port on your phone. The cable will wear out over time as well, so trying a different one may also help.
You'd probably want something closer to a USB C power meter. A killawatt would measure the overhead from the charger brick rectifying AC to DC. If you happen to have a killawatt on hand it would work fine most likely.