That info would be listed in the specs for that card:
ASUS ThunderboltEX 3-TR is a Thunderbolt™ 3 add-on card that delivers 40 Gbps bi-directional bandwidth and DisplayPort™ 1.4 support. It's able to support up to six Thunderbolt-enabled devices in a daisy-chain configuration, and its USB Type-C® port enables up to 100-watt charging for laptops.
www.asus.com
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RAID function Support:
Intel® VROC ready for X299, Z370 and Z390 Series Motherboard models. (It supports Intel® SSDs only.)
AMD® X399/X470/B450/X370/B350 Series Motherboard models*
* Maximum number of M.2 SSD support will vary, depending on different CPUs. Please see the FAQ link for further information:
https://www.asus.com/support/FAQ/1037507
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The real question is....why RAID 0 with 2x NVMe drives?