USB Type-A outlets are often unable to provide sufficient power to charge an iPad that has a USB-C power connection. USB Type-A power outlets, in particular within furniture, typically have very limited power output - and are often of dubious quality. While perhaps adequate for older models of iPad, they may be unsuitable for modern devices with greater power needs.
Generally, you would be best advised to use a USB-C Power Adapter or other USB-C power source. Using a USB Type-A to USB-C cable does not address the fundamental requirement to provide adequate power to the connected device from a suitable power source.
Most models of iPad require a Power Adapter (or other USB power source) rated 12W (i.e., 2.4A @5V) or greater to reliably charge. 5W Power Adapters (1.0A @5V) intended for older models of iPhone are inadequate to charge an iPad; if the iPad charges at all, charging will be very slow. In most countries, recent models of iPad are supplied with a 20W USB-C Power Adapter. At 12W, modern iPads will charge only very slowly; any less and charging will likely cease, but available power might be sufficient to supplement the power being supplied from the iPad's internal battery.
Some third-party USB-C power adapters (and portable PowerBanks) may not support USB PD (Power Delivery). Power Delivery mutually negotiates the charging voltage; the source, load and cable are all elements involved in the negotiation protocol. Unless the Power Adapter explicitly supports USB PD, it will almost certainly fail to charge the iPad; proprietary charging standards, such as QC (Quick Charge), are not supported.
Many computer USB ports also cannot source sufficient power to charge an iPad. Unless explicitly designed for charging connected devices, computer (and furniture) USB ports are typically limited to 0.5-1A @5V (i.e., 2.5-5.0W).
