work for you?
HQST 100 Watt 12 Volt Monocrystalline Solar Panel $76.99 with FS
you would need at least a charge controller with USB and most likely another set of cables to hook the 2 together.
(they make adapter cables that would allow you to hook this directly to a Jackery type powerstation)
Many of the portable solar panels already have a usb interface built into them
and you can charge directly from them.
something like this > https://www.amazon.com/Explorer-Generator-Kickstand-Connector-Controller/dp/B099ZPP6KC/ref=rvi_13/140-9720635-3269405?pd_rd_w=dSsDb&pf_rd_p=c0296674-5a83-4ad6-b035-0702d2b359df&pf_rd_r=HFB0PQ8ETFYZDSJ541S2&pd_rd_r=83d0af70-9bee-4869-901f-9de3432aef4a&pd_rd_wg=2VOqR&pd_rd_i=B099ZPP6KC&th=1