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
Wattz by Dustin Brown on fdroid
Best option would be Ampere by Brian_trapp on the Play Store. App is super easy to use and has both charging and discharging levels.
Assuming you have a recent device which supports USB-PD, you can get USB-C cables that have a small display built in that tells you how much power the device is currently pulling, in watts. It won't help you validate your other cables, but will help you determine if the problem is really in the phone.
But your problem may be even easier to fix. Sometimes schmutz gets stuck in your USB-C port and prevents the cables from getting fully plugged in, or prevents the clips from engaging to keep the cable secure. Get a (plastic!) toothpick and use that to root around the port a bit, then use a can of air to clean it out.
Yes, I think I have a combination of "not so good" cables and "dirty" socket. Having an app helps to measure the problem and any improvements.
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.
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