Do keep in mind that this is not a recommended way to do things. If we have doubts about Trust Wallet, its trust, quality, motives of the developers and partners working with them, we shouldn't be trusting a recovery phrase that was generated in such an environment either. Exporting the seed from Trust Wallet and importing it it into Blue Wallet or anywhere else doesn't make that seed more secure because it got created by a wallet you don't trust.

It's much better to create a brand-new seed on Blue Wallet and move your coins from Trust Wallet altogether.
Another example: A seed created on a computer that is non-stop connected to the internet and used for various activities isn't the same as a wallet that is set up and generated on an airgapped system that is permanently disconnected from the internet or a hardware wallet.